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class="vector-toc-list"> </ul> </li> <li id="toc-Notes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Notes</span> </div> </a> <ul id="toc-Notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> 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title="Das U-Boot – German" lang="de" hreflang="de" data-title="Das U-Boot" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Das_U-Boot" title="Das U-Boot – Spanish" lang="es" hreflang="es" data-title="Das U-Boot" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/Das_U-Boot" title="Das U-Boot – Persian" lang="fa" hreflang="fa" data-title="Das U-Boot" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Das_U-Boot" title="Das U-Boot – French" lang="fr" hreflang="fr" 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class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Open-source, primary boot the device's operating system kernel</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the <a href="/wiki/Boot_loader" class="mw-redirect" title="Boot loader">boot loader</a>. For other uses, see <a href="/wiki/Das_Boot_(disambiguation)" class="mw-disambig" title="Das Boot (disambiguation)">Das Boot (disambiguation)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">Das U-Boot</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:U-Boot_Logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/U-Boot_Logo.svg/220px-U-Boot_Logo.svg.png" decoding="async" width="220" height="289" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/U-Boot_Logo.svg/330px-U-Boot_Logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9e/U-Boot_Logo.svg/440px-U-Boot_Logo.svg.png 2x" data-file-width="186" data-file-height="244" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data">DENX Software Engineering</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">October 15, 1999<span class="noprint">; 25 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1999-10-15</span>)</span></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">v2024.04 / April 2, 2024<span class="noprint">; 7 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2024-04-02</span>)</span><sup id="cite_ref-u-boot--ann-549827_1-0" class="reference"><a href="#cite_note-u-boot--ann-549827-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://source.denx.de/u-boot/u-boot">source<wbr />.denx<wbr />.de<wbr />/u-boot<wbr />/u-boot</a></span> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1170607#P1324" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></li></ul> </div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/C_(programming_language)" title="C (programming language)">C</a>, <a href="/wiki/Assembly_language" title="Assembly language">Assembly</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Available in</th><td class="infobox-data">English</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Boot_loader" class="mw-redirect" title="Boot loader">Boot loader</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/GNU_General_Public_License#Version_2" title="GNU General Public License">GPL-2.0-or-later</a><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://docs.u-boot.org/en/latest/">docs<wbr />.u-boot<wbr />.org<wbr />/en<wbr />/latest<wbr />/</a></span> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1170607?uselang=en#P856" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr></tbody></table> <p><b>Das U-Boot</b> (subtitled "the Universal Boot Loader" and often shortened to <b>U-Boot</b>; see <i><a href="#History">History</a></i> for more about the name) is an <a href="/wiki/Open-source_software" title="Open-source software">open-source</a> <a href="/wiki/Bootloader" title="Bootloader">boot loader</a> used in <a href="/wiki/Embedded_system" title="Embedded system">embedded devices</a> to perform various low-level hardware initialization tasks and boot the device's operating system kernel. It is available for a number of <a href="/wiki/Computer_architecture" title="Computer architecture">computer architectures</a>, including <a href="/wiki/Motorola_68000_series" title="Motorola 68000 series">M68000</a>, <a href="/wiki/ARM_architecture" class="mw-redirect" title="ARM architecture">ARM</a>, <a href="/wiki/Blackfin" title="Blackfin">Blackfin</a>, <a href="/wiki/MicroBlaze" title="MicroBlaze">MicroBlaze</a>, <a href="/wiki/AArch64" title="AArch64">AArch64</a>, <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a>, <a href="/wiki/Nios_II" title="Nios II">Nios II</a>, <a href="/wiki/SuperH" title="SuperH">SuperH</a>, <a href="/wiki/PowerPC" title="PowerPC">PPC</a>, <a href="/wiki/RISC-V" title="RISC-V">RISC-V</a>, <a href="/wiki/LoongArch" class="mw-redirect" title="LoongArch">LoongArch</a> and <a href="/wiki/X86_architecture" class="mw-redirect" title="X86 architecture">x86</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Functionality">Functionality</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=1" title="Edit section: Functionality"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>U-Boot is both a first-stage and second-stage bootloader. It is loaded by the system's ROM (e.g. on-chip ROM of an ARM CPU) from a supported boot device, such as an SD card, SATA drive, NOR flash (e.g. using <a href="/wiki/Serial_Peripheral_Interface_Bus" class="mw-redirect" title="Serial Peripheral Interface Bus">SPI</a> or <a href="/wiki/I%C2%B2C" title="I²C">I²C</a>), or NAND flash. If there are size constraints, U-Boot may be split into two stages: the platform would load a small SPL (Secondary Program Loader), which is a stripped-down version of U-Boot, and the SPL would do some initial hardware configuration (e.g. <a href="/wiki/DRAM" class="mw-redirect" title="DRAM">DRAM</a> initialization using CPU cache as RAM) and load the larger, fully featured version of U-Boot.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Regardless of whether the SPL is used, U-Boot performs both first-stage (e.g., configuring <a href="/wiki/Memory_controller" title="Memory controller">memory controller</a> and <a href="/wiki/SDRAM" class="mw-redirect" title="SDRAM">SDRAM</a>) and second-stage booting (e.g., configuring <a href="/wiki/Mainboard" class="mw-redirect" title="Mainboard">mainboard</a> and other I/O devices, loading <a href="/wiki/Device_tree" class="mw-redirect" title="Device tree">device tree</a> and loading <a href="/wiki/Operating_system_kernel" class="mw-redirect" title="Operating system kernel">OS kernel</a> from storage device). </p><p>U-Boot implements a subset of the <a href="/wiki/UEFI" title="UEFI">UEFI</a> specification as defined in the Embedded Base Boot Requirements (EBBR) specification.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> UEFI binaries like <a href="/wiki/GRUB" class="mw-redirect" title="GRUB">GRUB</a> or the <a href="/wiki/Linux" title="Linux">Linux</a> kernel can be booted via the boot manager or from the command-line interface. </p><p>U-Boot runs a <a href="/wiki/Command-line_interface" title="Command-line interface">command-line interface</a> on a console or a serial port. Using the CLI, users can load and boot a kernel, possibly changing parameters from the default. There are also commands to read device information, read and write flash memory, download files (kernels, boot images, etc.) from the serial port or network, manipulate <a href="/wiki/Device_tree" class="mw-redirect" title="Device tree">device trees</a>, and work with environment variables (which can be written to persistent storage, and are used to control U-Boot behavior such as the default boot command and timeout before auto-booting, as well as hardware data such as the Ethernet MAC address). </p><p>Unlike PC bootloaders which obscure or automatically choose the memory locations of the kernel and other boot data, U-Boot requires its boot commands to explicitly specify the physical memory addresses as destinations for copying data (kernel, ramdisk, device tree, etc.) and for jumping to the kernel and as arguments for the kernel. Because U-Boot's commands are fairly low-level, it takes several steps to boot a kernel, but this also makes U-Boot more flexible than other bootloaders, since the same commands can be used for more general tasks. It's even possible to upgrade U-Boot using U-Boot, simply by reading the new bootloader from somewhere (local storage, or from the serial port or network) into memory, and writing that data to persistent storage where the bootloader belongs. </p><p>U-Boot has support for USB, so it can use a USB keyboard to operate the console (in addition to input from the serial port), and it can access and boot from USB Mass Storage devices such as SD card readers. </p> <div class="mw-heading mw-heading3"><h3 id="Data_storage_and_boot_sources">Data storage and boot sources</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=2" title="Edit section: Data storage and boot sources"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>U-Boot boots an operating system by reading the kernel and any other required data (e.g. device tree or ramdisk image) into memory, and then executing the kernel with the appropriate arguments. </p><p>U-Boot's commands are actually generalized commands which can be used to read or write any arbitrary data. Using these commands, data can be read from or written to any storage system that U-Boot supports, which include: </p><p>(Note: These are boot sources from which U-Boot is capable of loading data (e.g. a kernel or ramdisk image) into memory. U-Boot itself must be booted by the platform, and that must be done from a device that the platform's ROM is capable of booting from, which naturally depends on the platform.) </p> <ul><li>Onboard or attached storage <ul><li>SD card</li> <li>SATA</li> <li>SCSI</li> <li><a href="/wiki/I%C2%B2C" title="I²C">I²C</a> (e.g. EEPROMs or NOR flash)</li> <li><a href="/wiki/Serial_Peripheral_Interface_Bus" class="mw-redirect" title="Serial Peripheral Interface Bus">SPI</a> (e.g. NOR or NAND flash)</li> <li><a href="/wiki/Open_NAND_Flash_Interface_Working_Group" title="Open NAND Flash Interface Working Group">ONFI</a> (raw NAND flash)</li> <li><a href="/wiki/EMMC" class="mw-redirect" title="EMMC">eMMC</a> (managed NOR or NAND flash)</li> <li><a href="/wiki/EUFS" class="mw-redirect" title="EUFS">eUFS</a> (managed NAND flash)</li> <li><a href="/wiki/NVM_Express" title="NVM Express">NVMe</a></li> <li>USB mass storage device</li></ul></li> <li>Serial port (file transfer) <ul><li><a href="/wiki/Kermit_(protocol)" title="Kermit (protocol)">Kermit</a></li> <li><a href="/wiki/SREC_(file_format)" title="SREC (file format)">S-Record</a></li> <li><a href="/wiki/YMODEM" title="YMODEM">YMODEM</a></li></ul></li> <li>Network boot (optionally using DHCP, BOOTP, or RARP) <ul><li><a href="/wiki/TFTP" class="mw-redirect" title="TFTP">TFTP</a></li> <li><a href="/wiki/Network_File_System" title="Network File System">NFS</a><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup></li></ul></li></ul> <p>On some embedded device implementations, the CPU or SoC will locate and load the bootloader (such as Das U-Boot) from the boot partition (such as <a href="/wiki/Ext4" title="Ext4">ext4</a> or <a href="/wiki/File_Allocation_Table" title="File Allocation Table">FAT</a> filesystems) directly. </p> <div class="mw-heading mw-heading3"><h3 id="Compatible_file_systems">Compatible file systems</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=3" title="Edit section: Compatible file systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>U-Boot does not need to be able to read a filesystem in order for the kernel to use it as a root filesystem or initial ramdisk; U-Boot simply provides an appropriate parameter to the kernel, and/or copies the data to memory without understanding its contents. </p><p>However, U-Boot can also read from (and in some cases, write to) filesystems. This way, rather than requiring the data that U-Boot will load to be stored at a fixed location on the storage device, U-Boot can read the filesystem to search for and load the kernel, device tree, etc., by pathname. </p><p>U-Boot includes support for these filesystems: </p> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 15em;"> <ul><li><a href="/wiki/Btrfs" title="Btrfs">btrfs</a></li> <li>CBFS (<a href="/wiki/Coreboot" title="Coreboot">coreboot</a> file system)</li> <li><a href="/wiki/Cramfs" title="Cramfs">Cramfs</a></li> <li><a href="/wiki/Ext2" title="Ext2">ext2</a></li> <li><a href="/wiki/Ext3" title="Ext3">ext3</a></li> <li><a href="/wiki/Ext4" title="Ext4">ext4</a></li> <li><a href="/wiki/F2FS" title="F2FS">F2FS</a></li> <li><a href="/wiki/File_Allocation_Table" title="File Allocation Table">FAT</a></li> <li><a href="/wiki/CP/M" title="CP/M">FDOS</a></li> <li><a href="/wiki/JFFS2" title="JFFS2">JFFS2</a></li> <li><a href="/wiki/ReiserFS" title="ReiserFS">ReiserFS</a></li> <li><a href="/wiki/Squashfs" class="mw-redirect" title="Squashfs">Squashfs</a></li> <li><a href="/wiki/UBIFS" title="UBIFS">UBIFS</a></li> <li><a href="/wiki/YAFFS" title="YAFFS">YAFFS</a></li> <li><a href="/wiki/ZFS" title="ZFS">ZFS</a></li></ul> </div> <div class="mw-heading mw-heading3"><h3 id="Device_tree">Device tree</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=4" title="Edit section: Device tree"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Device_tree" class="mw-redirect" title="Device tree">Device tree</a></div> <p><i>Device tree</i> is a data structure for describing hardware layout. Using Device tree, a vendor might be able to use a less modified <i>mainline</i> U-Boot on otherwise special purpose hardware. As also adopted by the Linux kernel, Device tree is intended to ameliorate the situation in the <a href="/wiki/Embedded_computer" class="mw-redirect" title="Embedded computer">embedded</a> industry, where a vast number of product specific <a href="/wiki/Fork_(software)" class="mw-redirect" title="Fork (software)">forks</a> (of U-Boot and Linux) exist. The ability to run mainline software practically gives customers indemnity against lack of vendor updates. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=5" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:U-boot_openmoko_freerunner.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/U-boot_openmoko_freerunner.jpg/220px-U-boot_openmoko_freerunner.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/U-boot_openmoko_freerunner.jpg/330px-U-boot_openmoko_freerunner.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/40/U-boot_openmoko_freerunner.jpg/440px-U-boot_openmoko_freerunner.jpg 2x" data-file-width="3264" data-file-height="2448" /></a><figcaption>U-Boot on the <a href="/wiki/Neo_FreeRunner" class="mw-redirect" title="Neo FreeRunner">Openmoko Freerunner</a> </figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:U-boot.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ad/U-boot.png/220px-U-boot.png" decoding="async" width="220" height="198" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ad/U-boot.png/330px-U-boot.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ad/U-boot.png/440px-U-boot.png 2x" data-file-width="857" data-file-height="772" /></a><figcaption>U-Boot on the XPedite5501</figcaption></figure> <p>The project started as a 8xx PowerPC bootloader called <b>8xxROM</b> written by Magnus Damm.<sup id="cite_ref-ppc_8-0" class="reference"><a href="#cite_note-ppc-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> In October 1999 Wolfgang Denk moved the project to SourceForge.net and renamed it to <b>PPCBoot</b>, because SF.net did not allow project names starting with digits.<sup id="cite_ref-ppc_8-1" class="reference"><a href="#cite_note-ppc-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Version 0.4.1 of PPCBoot was first publicly released July 19, 2000. </p><p>In 2002 a previous version of the <a href="/wiki/Source_code" title="Source code">source code</a> was briefly <a href="/wiki/Fork_(software_development)" title="Fork (software development)">forked</a> into a product called <b>ARMBoot</b>, but was merged back into the PPCBoot project shortly thereafter. On October 31, 2002 <b>PPCBoot−2.0.0</b> was released. This marked the last release under the PPCBoot name, as it was renamed to reflect its ability to work on other architectures besides the PPC ISA.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-history_10-0" class="reference"><a href="#cite_note-history-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>PPCBoot−2.0.0 became <b>U−Boot−0.1.0</b> in November 2002, expanded to work on the <a href="/wiki/X86" title="X86">x86</a> processor architecture. Additional architecture capabilities were added in the following months: <a href="/wiki/MIPS32" class="mw-redirect" title="MIPS32">MIPS32</a> in March 2003, <a href="/wiki/MIPS64" class="mw-redirect" title="MIPS64">MIPS64</a> in April, <a href="/wiki/Nios_II" title="Nios II">Nios II</a> in October, <a href="/wiki/ColdFire" class="mw-redirect" title="ColdFire">ColdFire</a> in December, and <a href="/wiki/MicroBlaze" title="MicroBlaze">MicroBlaze</a> in April 2004. The May 2004 release of U-Boot-1.1.2 worked on the products of 216 board manufacturers across the various architectures.<sup id="cite_ref-history_10-1" class="reference"><a href="#cite_note-history-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>The current name <b>Das U-Boot</b> adds a <a href="/wiki/German_articles#Definite_article" title="German articles">German definite article</a>, to create a bilingual <a href="/wiki/Pun" title="Pun">pun</a> on the classic 1981 German submarine film <i><a href="/wiki/Das_Boot" title="Das Boot">Das Boot</a></i>, which takes place on a World War II German <a href="/wiki/U-boat" title="U-boat">U-boat</a>. It is <a href="/wiki/Free_software" title="Free software">free software</a> released under the terms of the <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GNU General Public License</a>. It can be built on an x86 PC for any of its intended architectures using a cross development GNU <a href="/wiki/Programming_tool" title="Programming tool">toolchain</a>, for example crosstool, the Embedded Linux Development Kit (ELDK) or OSELAS.Toolchain. </p><p>The importance of U-Boot in embedded Linux systems is quite succinctly stated in the book <i>Building Embedded Linux Systems</i>, by Karim Yaghmour, whose text about U-Boot begins, "Though there are quite a few other bootloaders, 'Das U-Boot', the universal bootloader, is arguably the richest, most flexible, and most actively developed open source bootloader available."<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Usages">Usages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=6" title="Edit section: Usages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>The ARM-based <a href="/wiki/Chromebooks" class="mw-redirect" title="Chromebooks">Chromebooks</a> ship with U-Boot. The Celeron- and i5-based Chromebooks use it as payload for <a href="/wiki/Coreboot" title="Coreboot">coreboot</a>.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></li> <li>The <a href="/wiki/PowerPC" title="PowerPC">PowerPC</a> based series of <a href="/wiki/AmigaOne" title="AmigaOne">AmigaOne</a> computers running <a href="/wiki/AmigaOS" title="AmigaOS">AmigaOS</a> use U-Boot, in particular the <a href="/wiki/Sam440ep" title="Sam440ep">Sam440ep</a> and <a href="/wiki/Sam460ex" title="Sam460ex">Sam460ex</a> by <a href="/wiki/ACube_Systems_Srl" title="ACube Systems Srl">ACube Systems Srl</a>, and the AmigaOne X5000 by A-Eon, the successor of the <a href="/wiki/AmigaOne_X1000" title="AmigaOne X1000">AmigaOne X1000</a>.</li> <li><a href="/wiki/Ubiquiti_Networks" class="mw-redirect" title="Ubiquiti Networks">Ubiquiti Networks</a> devices use U-Boot.</li> <li><a href="/wiki/Amazon_Kindle" title="Amazon Kindle">Amazon Kindle</a> and <a href="/wiki/Kobo_eReader" title="Kobo eReader">Kobo eReader</a> devices use U-Boot as their bootloader.</li> <li>TP-Link and several other OpenWRT/LEDE compatible MIPS based wireless routers use U-Boot for bootloading.</li> <li>Teltonika cellular routers use bootloader based on U-Boot.</li> <li>SpaceX's Falcon and Dragon both use U-Boot.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Asahi_Linux" title="Asahi Linux">Asahi Linux</a> uses it as payload for m1n1 in order to boot Linux on <a href="/wiki/Apple_silicon" title="Apple silicon">Apple Silicon</a> Mac.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{clear:left;float:left;margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><span class="portalbox-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/28px-Free_and_open-source_software_logo_%282009%29.svg.png" decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/42px-Free_and_open-source_software_logo_%282009%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/56px-Free_and_open-source_software_logo_%282009%29.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></span><span class="portalbox-link"><a href="/wiki/Portal:Free_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></span></li></ul> <ul><li><a href="/wiki/Comparison_of_boot_loaders" class="mw-redirect" title="Comparison of boot loaders">Comparison of boot loaders</a></li> <li><a href="/wiki/RedBoot" title="RedBoot">RedBoot</a></li> <li><a href="/wiki/Coreboot" title="Coreboot">Coreboot</a></li> <li><a href="/wiki/Barebox" title="Barebox">Barebox</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=8" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-alpha"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">This is true NFS boot (U-Boot itself uses NFS to load the kernel), as opposed to loading a kernel from the network using TFTP and specifying that the kernel should use an NFS mount as its root filesystem.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=9" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-u-boot--ann-549827-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-u-boot--ann-549827_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFRini2024" class="citation mailinglist cs1">Rini, Tom (2 April 2024). <a rel="nofollow" class="external text" href="https://lists.denx.de/pipermail/u-boot/2024-April/549827.html">"U-Boot v2024.04 released"</a>. <i>u-boot</i> (Mailing list)<span class="reference-accessdate">. Retrieved <span class="nowrap">2 April</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=U-Boot+v2024.04+released&rft.date=2024-04-02&rft.aulast=Rini&rft.aufirst=Tom&rft_id=https%3A%2F%2Flists.denx.de%2Fpipermail%2Fu-boot%2F2024-April%2F549827.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://git.denx.de/?p=u-boot.git;a=blob_plain;f=README;hb=HEAD">"Das U-Boot's licence"</a>. <i>git.denx.de</i>. 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-10-13</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=git.denx.de&rft.atitle=Das+U-Boot%27s+licence&rft.date=2013&rft_id=http%3A%2F%2Fgit.denx.de%2F%3Fp%3Du-boot.git%3Ba%3Dblob_plain%3Bf%3DREADME%3Bhb%3DHEAD&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://xillybus.com/tutorials/u-boot-image-altera-soc">"Preparing a Uboot image for Altera's Cyclone V SoC FPGA"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Preparing+a+Uboot+image+for+Altera%27s+Cyclone+V+SoC+FPGA&rft_id=http%3A%2F%2Fxillybus.com%2Ftutorials%2Fu-boot-image-altera-soc&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://boundarydevices.com/u-boot-on-i-mx6/">"U-Boot on i.MX6"</a>. 18 June 2013.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=U-Boot+on+i.MX6&rft.date=2013-06-18&rft_id=https%3A%2F%2Fboundarydevices.com%2Fu-boot-on-i-mx6%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20170905031943/https://blackfin.uclinux.org/doku.php?id=bootloaders:u-boot:features">"Bootloaders:u-boot:features [Analog Devices Open Source| Mixed-signal and Digital Signal Processing ICs]"</a>. Archived from <a rel="nofollow" class="external text" href="https://blackfin.uclinux.org/doku.php?id=bootloaders:u-boot:features">the original</a> on 2017-09-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-06-15</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Bootloaders%3Au-boot%3Afeatures+%26%2391%3BAnalog+Devices+Open+Source%26%23124%3B+Mixed-signal+and+Digital+Signal+Processing+ICs%26%2393%3B&rft_id=https%3A%2F%2Fblackfin.uclinux.org%2Fdoku.php%3Fid%3Dbootloaders%3Au-boot%3Afeatures&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://github.com/arm-software/ebbr">https://github.com/arm-software/ebbr</a>, Embedded Base Boot Requirements (EBBR) specification, retrieved 2021-03-25</span> </li> <li id="cite_note-ppc-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-ppc_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ppc_8-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://ppcboot.sourceforge.net/#authors">PPCBoot Homepage: Authors</a></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20040127050919/http://www.geocrawler.com/archives/3/4205/2002/10/0/10043434/">"[PPCBoot-users] Halloween release of PPCBoot: 2.0.0 - the Final Release."</a>, Wolfgang Denk, 31 October 2002</span> </li> <li id="cite_note-history-10"><span class="mw-cite-backlink">^ <a href="#cite_ref-history_10-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-history_10-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.denx.de/wiki/view/U-Bootdoc/History">"U-Bootdoc History"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">September 4,</span> 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=U-Bootdoc+History&rft_id=http%3A%2F%2Fwww.denx.de%2Fwiki%2Fview%2FU-Bootdoc%2FHistory&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://oreilly.com/catalog/9780596002220/">Building Embedded Linux Systems by Kareem Yaghmour, Chapter 9 </a></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://docs.google.com/presentation/d/1eGPMu03vCxIO0a3oNX8Hmij_Qwwz6R6ViFC_1HlHOYQ/">coreboot tutorial oscon 2013</a>, p. 6</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.reddit.com/r/spacex/comments/gxb7j1/we_are_the_spacex_software_team_ask_us_anything/ft6fngd/">We are the SpaceX software team, ask us anything!</a>, reply 4</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/AsahiLinux/docs/wiki/U-Boot">"U Boot · AsahiLinux/docs Wiki"</a>. <i>GitHub</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2022-04-29</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=U+Boot+%C2%B7+AsahiLinux%2Fdocs+Wiki&rft_id=https%3A%2F%2Fgithub.com%2FAsahiLinux%2Fdocs%2Fwiki%2FU-Boot&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADas+U-Boot" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Das_U-Boot&action=edit&section=10" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://docs.u-boot.org/en/latest/">Official website</a></span></span> <span class="mw-valign-text-top" typeof="mw:File/Frameless"><a 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style="width:1%">General terms</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">ASIC</a></li> <li><a href="/wiki/Board_support_package" title="Board support package">Board support package</a></li> <li><a href="/wiki/Bootloader" title="Bootloader">Bootloader</a></li> <li><a href="/wiki/Consumer_electronics" title="Consumer electronics">Consumer electronics</a></li> <li><a href="/wiki/Cross_compiler" title="Cross compiler">Cross compiler</a></li> <li><a href="/wiki/Embedded_database" title="Embedded database">Embedded database</a></li> <li><a href="/wiki/Embedded_hypervisor" title="Embedded hypervisor">Embedded hypervisor</a></li> <li><a href="/wiki/Embedded_operating_system" title="Embedded operating system">Embedded OS</a></li> <li><a href="/wiki/Embedded_software" title="Embedded software">Embedded software</a></li> <li><a href="/wiki/Field-programmable_gate_array" title="Field-programmable gate array">FPGA</a></li> <li><a href="/wiki/Internet_of_things" title="Internet of things">IoT</a></li> <li><a href="/wiki/Memory_footprint" title="Memory footprint">Memory footprint</a></li> <li><a href="/wiki/Microcontroller" title="Microcontroller">Microcontroller</a></li> <li><a href="/wiki/Single-board_computer" title="Single-board computer">Single-board computer</a> <ul><li><a href="/wiki/Raspberry_Pi" title="Raspberry Pi">Raspberry Pi</a></li></ul></li> <li><a href="/wiki/System_on_a_chip" title="System on a chip">SoC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Firmware" title="Firmware">Firmware</a> and controls</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Firmware" title="Firmware">Firmware</a> <ul><li><a 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title="UEFI">UEFI</a></li> <li><a href="/wiki/Vendor_lock-in" title="Vendor lock-in">Vendor lock-in</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Booting" title="Booting">Boot loaders</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">U-Boot</a></li> <li><a href="/wiki/Barebox" title="Barebox">Barebox</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Library_(computing)" title="Library (computing)">Software libraries</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/UClibc" title="UClibc">uClibc</a></li> <li><a href="/wiki/Dietlibc" title="Dietlibc">dietlibc</a></li> <li><a href="/wiki/Embedded_GLIBC" class="mw-redirect" title="Embedded GLIBC">Embedded GLIBC</a></li> <li><a href="/wiki/LwIP" title="LwIP">lwIP</a></li> <li><a href="/wiki/Musl" title="Musl">musl</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Programming_tool" title="Programming tool">Programming tools</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Almquist_shell" title="Almquist shell">Almquist shell</a></li> <li><a href="/wiki/BitBake" title="BitBake">BitBake</a></li> <li><a href="/wiki/Buildroot" title="Buildroot">Buildroot</a></li> <li><a href="/wiki/BusyBox" title="BusyBox">BusyBox</a></li> <li><a href="/wiki/OpenEmbedded" title="OpenEmbedded">OpenEmbedded</a></li> <li><a href="/wiki/Stand-alone_shell" title="Stand-alone shell">Stand-alone shell</a></li> <li><a href="/wiki/Toybox" title="Toybox">Toybox</a></li> <li><a href="/wiki/Yocto_Project" title="Yocto Project">Yocto Project</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Embedded_operating_system" title="Embedded operating system">Operating systems</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Linux_on_embedded_systems" title="Linux on embedded systems">Linux on embedded systems</a></li> <li><a href="/wiki/Linux_for_mobile_devices" title="Linux for mobile devices">Linux for mobile devices</a></li> <li><a href="/wiki/Light-weight_Linux_distribution" title="Light-weight Linux distribution">Light-weight Linux distribution</a></li> <li><a href="/wiki/Real-time_operating_system" title="Real-time operating system">Real-time operating system</a></li> <li><a href="/wiki/Windows_IoT" title="Windows IoT">Windows IoT</a> <ul><li><a href="/wiki/Windows_Embedded_Compact" title="Windows Embedded Compact">Win CE</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Programming_language" title="Programming language">Programming languages</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ada_(programming_language)" title="Ada (programming language)">Ada</a></li> <li><a href="/wiki/Assembly_language" title="Assembly language">Assembly language</a></li> <li><a href="/w/index.php?title=Communication_Access_Programming_Language&action=edit&redlink=1" class="new" title="Communication Access Programming Language (page does not exist)">CAPL</a></li> <li><a href="/wiki/Embedded_C" title="Embedded C">Embedded C</a></li> <li><a href="/wiki/Embedded_C%2B%2B" title="Embedded C++">Embedded C++</a></li> <li><a href="/wiki/Embedded_Java" title="Embedded Java">Embedded Java</a></li> <li><a href="/wiki/MISRA_C" title="MISRA C">MISRA C</a></li> <li><a href="/wiki/MicroPython" title="MicroPython">MicroPython</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Comparison_of_lightweight_web_browsers" title="Comparison of lightweight web browsers">Lightweight browsers</a></li> <li><a href="/wiki/List_of_open-source_hardware" class="mw-redirect" title="List of open-source hardware">List of open-source hardware</a></li> <li><a href="/wiki/Open-source_robotics" title="Open-source robotics">Open-source robotics</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Firmware_and_booting" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Firmware_and_booting" title="Template:Firmware and booting"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Firmware_and_booting" title="Template talk:Firmware and booting"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Firmware_and_booting" title="Special:EditPage/Template:Firmware and booting"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Firmware_and_booting" style="font-size:114%;margin:0 4em"><a href="/wiki/Firmware" title="Firmware">Firmware</a> and <a href="/wiki/Booting" title="Booting">booting</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Processes</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Booting_process_of_Windows" title="Booting process of Windows">Windows</a></span> <ul><li><span class="nowrap"><a href="/wiki/Architecture_of_Windows_9x#Boot_sequence" title="Architecture of Windows 9x">9x</a></span></li> <li><span class="nowrap"><a href="/wiki/Booting_process_of_Windows_NT" class="mw-redirect" title="Booting process of Windows NT">NT</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Booting_process_of_Linux" title="Booting process of Linux">Linux</a></span> <ul><li><span class="nowrap"><a href="/wiki/Booting_process_of_Android_devices" title="Booting process of Android devices">Android</a></span></li></ul></li></ul> </div></td><td class="noviewer navbox-image" rowspan="10" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg/100px-WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg" decoding="async" width="100" height="100" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg/150px-WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f8/WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg/200px-WD_Blue_WD5000LPVX_-_controller_-_Winbond_25X20CLVIG-0182.jpg 2x" data-file-width="1535" data-file-height="1535" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Booting <a href="/wiki/Firmware#Computers" title="Firmware">firmware</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Proprietary_firmware" title="Proprietary firmware">Proprietary firmware</a></span></li> <li><span class="nowrap"><a href="/wiki/Open-source_firmware" title="Open-source firmware">Open-source firmware</a></span></li> <li><span class="nowrap"><a href="/wiki/Custom_firmware" title="Custom firmware">Custom firmware</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Interfaces</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/UEFI" title="UEFI">UEFI</a></span></li> <li><span class="nowrap"><a href="/wiki/BIOS" title="BIOS">BIOS</a></span> <ul><li><span class="nowrap"><a href="/wiki/Video_BIOS" title="Video BIOS">Video BIOS</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Open_Firmware" title="Open Firmware">Open Firmware</a></span></li> <li><span class="nowrap"><a href="/wiki/ACPI" title="ACPI">ACPI</a></span></li> <li><span class="nowrap"><a href="/wiki/MultiProcessor_Specification" title="MultiProcessor Specification">MultiProcessor Specification</a></span></li> <li><span class="nowrap"><a href="/wiki/Advanced_Power_Management" title="Advanced Power Management">APM</a></span></li> <li><span class="nowrap"><a href="/wiki/Legacy_Plug_and_Play" title="Legacy Plug and Play">Legacy Plug and Play</a></span></li> <li><span class="nowrap"><a href="/wiki/ARC_(specification)" title="ARC (specification)">AlphaBIOS</a></span></li> <li><span class="nowrap"><a href="/wiki/SRM_firmware" title="SRM firmware">SRM</a></span></li> <li><span class="nowrap"><a href="/wiki/Simple_Firmware_Interface" title="Simple Firmware Interface">SFI</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Implementations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/SeaBIOS" title="SeaBIOS">SeaBIOS</a></span></li> <li><span class="nowrap"><a href="/wiki/Award_Software" title="Award Software">Award BIOS</a></span></li> <li><span class="nowrap"><a href="/wiki/American_Megatrends" title="American Megatrends">American Megatrends</a></span> <ul><li><span class="nowrap"><a href="/wiki/AMIBIOS" class="mw-redirect" title="AMIBIOS">AMIBIOS</a></span></li> <li><span class="nowrap"><a href="/wiki/AMI_Aptio" class="mw-redirect" title="AMI Aptio">AMI Aptio</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Insyde_Software" title="Insyde Software">InsydeH2O</a></span></li> <li><span class="nowrap"><a href="/wiki/Phoenix_Technologies" title="Phoenix Technologies">Phoenix SecureCore UEFI</a></span></li> <li><span class="nowrap"><a href="/wiki/TianoCore_EDK_II" title="TianoCore EDK II">TianoCore EDK II</a></span></li> <li><span class="nowrap"><a href="/wiki/OpenBIOS" title="OpenBIOS">OpenBIOS</a></span></li> <li><span class="nowrap"><a href="/wiki/Coreboot" title="Coreboot">Coreboot</a></span></li> <li><span class="nowrap"><a href="/wiki/Libreboot" title="Libreboot">Libreboot</a></span></li> <li><span class="nowrap"><a href="/wiki/LinuxBoot" title="LinuxBoot">LinuxBoot</a></span></li> <li><span class="nowrap"><a href="/wiki/Kickstart_(Amiga)" title="Kickstart (Amiga)">Kickstart</a></span></li> <li><span class="nowrap"><a href="/wiki/Run-Time_Abstraction_Services" title="Run-Time Abstraction Services">Run-Time Abstraction Services</a></span></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hybrid firmware bootloader</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Common_Firmware_Environment" title="Common Firmware Environment">Common Firmware Environment</a> </span></li> <li><span class="nowrap"><a class="mw-selflink selflink">Das U-Boot</a></span></li> <li><span class="nowrap"><a href="/wiki/ARCS_(computing)" title="ARCS (computing)">ARCS</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Bootloaders" class="mw-redirect" title="Bootloaders">Bootloaders</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Bootloader_unlocking" title="Bootloader unlocking">Bootloader unlocking</a></span></li> <li><span class="nowrap"><a href="/wiki/Comparison_of_bootloaders" title="Comparison of bootloaders">Comparison of bootloaders</a></span></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Implementations" scope="row" class="navbox-group" style="width:1%">Implementations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Acronis_OS_Selector" class="mw-redirect" title="Acronis OS Selector">Acronis OS Selector</a></span></li> <li><span class="nowrap"><a href="/wiki/Barebox" title="Barebox">Barebox</a></span></li> <li><span class="nowrap"><a href="/wiki/BootManager" class="mw-redirect" title="BootManager">BootManager</a></span></li> <li><span class="nowrap"><a href="/wiki/BootX_(Apple)" title="BootX (Apple)">BootX (Apple)</a></span></li> <li><span class="nowrap"><a href="/wiki/BootX_(Linux)" title="BootX (Linux)">BootX (Linux)</a></span></li> <li><span class="nowrap"><a href="/wiki/GNU_GRUB" title="GNU GRUB">GNU GRUB</a></span></li> <li><span class="nowrap"><a href="/wiki/IBoot" title="IBoot">iBoot</a></span></li> <li><span class="nowrap"><a href="/wiki/Systemd-boot" title="Systemd-boot">systemd-boot</a></span></li> <li><span class="nowrap"><a href="/wiki/Loadlin" title="Loadlin">loadlin</a></span></li> <li><span class="nowrap"><a href="/wiki/NTLDR" title="NTLDR">NTLDR</a></span></li> <li><span class="nowrap"><a href="/wiki/OpeniBoot" title="OpeniBoot">OpeniBoot</a></span></li> <li><span class="nowrap"><a href="/wiki/RedBoot" title="RedBoot">RedBoot</a></span></li> <li><span class="nowrap"><a href="/wiki/REFInd" title="REFInd">rEFInd</a></span></li> <li><span class="nowrap"><a href="/wiki/REFIt" title="REFIt">rEFIt</a></span></li> <li><span class="nowrap"><a href="/wiki/SYSLINUX" title="SYSLINUX">SYSLINUX</a></span></li> <li><span class="nowrap"><a href="/wiki/Windows_Boot_Manager" title="Windows Boot Manager">Windows Boot Manager</a></span></li> <li><span class="nowrap"><a href="/wiki/XOSL" title="XOSL">xOSL</a></span></li> <li><span class="nowrap"><a href="/wiki/Yaboot" title="Yaboot">Yaboot</a></span></li> <li><span class="nowrap"><a href="/wiki/Plop_Boot_Manager" title="Plop Boot Manager">Plop Boot Manager</a></span></li> <li><span class="nowrap"><a href="/wiki/MILO_(bootloader)" title="MILO (bootloader)">MILO</a></span></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partition layouts</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/GUID_Partition_Table" title="GUID Partition Table">GUID Partition Table</a></span></li> <li><span class="nowrap"><a href="/wiki/Master_boot_record" title="Master boot record">Master boot record</a></span></li> <li><span class="nowrap"><a href="/wiki/Apple_Partition_Map" title="Apple Partition Map">Apple Partition Map</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/System_partition_and_boot_partition" title="System partition and boot partition">Partitions</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/EFI_system_partition" title="EFI system partition">EFI system partition</a></span></li> <li><span class="nowrap"><a href="/wiki/BIOS_boot_partition" title="BIOS boot partition">BIOS boot partition</a></span></li> <li><span class="nowrap"><a href="/wiki//boot/" title="/boot/">/boot/</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Utilities</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Software</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Flashrom_(utility)" title="Flashrom (utility)">flashrom</a></span></li> <li><span class="nowrap"><a href="/wiki/Fwupd" title="Fwupd">fwupd</a></span></li> <li><span class="nowrap"><a href="/wiki/UEFITool" title="UEFITool">UEFITool</a></span></li> <li><span class="nowrap"><a href="/wiki/Odin_(firmware_flashing_software)" title="Odin (firmware flashing software)">Odin</a></span> <ul><li><span class="nowrap"><a href="/wiki/Odin_(firmware_flashing_software)#Heimdall" title="Odin (firmware flashing software)">Heimdall</a></span></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hardware</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Bus_Pirate" title="Bus Pirate">Bus Pirate</a></span></li> <li><span class="nowrap"><a href="/wiki/Raspberry_Pi" title="Raspberry Pi">Raspberry Pi</a></span></li> <li><span class="nowrap"><a href="/wiki/FTDI" title="FTDI">ft2232</a></span></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Network_booting" title="Network booting">Network boot</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Preboot_Execution_Environment" title="Preboot Execution Environment">Preboot Execution Environment</a></span> <ul><li><span class="nowrap"><a href="/wiki/GPXE" title="GPXE">gPXE</a></span></li> <li><span class="nowrap"><a href="/wiki/IPXE" title="IPXE">iPXE</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/NetBoot" title="NetBoot">NetBoot</a></span></li> <li><span class="nowrap"><a href="/wiki/Remote_Initial_Program_Load" title="Remote Initial Program Load">Remote Initial Program Load</a></span></li> <li><span class="nowrap"><a href="/wiki/Wake-on-LAN" title="Wake-on-LAN">Wake-on-LAN</a></span></li> <li><span class="nowrap"><a href="/wiki/Wake-on-ring" title="Wake-on-ring">Wake-on-ring</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">ROM variants</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Read-only_memory" title="Read-only memory">ROM</a></span></li> <li><span class="nowrap"><a href="/wiki/Programmable_ROM" title="Programmable ROM">PROM</a></span></li> <li><span class="nowrap"><a href="/wiki/EPROM" title="EPROM">EPROM</a></span></li> <li><span class="nowrap"><a href="/wiki/EEPROM" title="EEPROM">EEPROM</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Boot_ROM" title="Boot ROM">Boot ROM</a></span></li> <li><span class="nowrap"><a href="/wiki/ROM_hacking" title="ROM hacking">ROM hacking</a></span></li> <li><span class="nowrap"><a href="/wiki/ROM_image" title="ROM image">ROM image</a></span></li> <li><span class="nowrap"><a href="/wiki/Execute_in_place" title="Execute in place">Execute in place</a></span></li> <li><span class="nowrap"><a href="/wiki/Devicetree" title="Devicetree">Devicetree</a></span></li> <li><span class="nowrap"><a href="/wiki/Fastboot" title="Fastboot">Fastboot</a></span></li> <li><span class="nowrap"><a href="/wiki/Instant-on" title="Instant-on">Instant-on</a></span></li> <li><span class="nowrap"><a href="/wiki/Power-on_self-test" title="Power-on self-test">Power-on self-test</a></span></li> <li><span class="nowrap"><a href="/wiki/Qualcomm_EDL_mode" title="Qualcomm EDL mode">EDL mode</a></span></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Das_U-Boot&oldid=1259083691">https://en.wikipedia.org/w/index.php?title=Das_U-Boot&oldid=1259083691</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Firmware" title="Category:Firmware">Firmware</a></li><li><a href="/wiki/Category:Free_boot_loaders" 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