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Article published by: Leah Rowe

Date of publication: 6 December 2024

Today’s Libreboot 20241206 revision is a stable release, whereas the previous testing release was Libreboot 20241008, and the previous stable release was Libreboot 20240612.

IMPORTANT ADVICE: PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING/UPDATING LIBREBOOT.

Libreboot is a free/open source BIOS/UEFI replacement on x86 and ARM, providing boot firmware that initialises the hardware in your computer, to then load an operating system (e.g. Linux/BSD). It is specifically a coreboot distribution, in the same way that Debian is a Linux distribution. It provides an automated build system to produce coreboot ROM images with a variety of payloads such as GNU GRUB or SeaBIOS, with regular well-tested releases to make coreboot as easy to use as possible for non-technical users. From a project management perspective, this works in exactly the same way as a Linux distro, providing a source-based package manager (called lbmk) which patches sources and compiles coreboot images. It makes use of coreboot for hardware initialisation, and then a payload such as SeaBIOS or GNU GRUB to boot your operating system; on ARM(chromebooks), we provide U-Boot (as a coreboot payload).

For Libreboot 20241206, today’s release, U-Boot is also provided as an optional coreboot payload on x86 machines. This provides a sensible UEFI implementation, useful for booting Linux/BSD systems more easily. More information available on the U-Boot x86 page.

This means that you can have a UEFI boot environment, even on machines where the original vendor firmware never supported it. For example, the ThinkPad X200 runs U-Boot virtually bug-free, and it can boot Linux distros via U-Boot’s UEFI implementation; that machine could not originally do UEFI.

This page lists all changes made since the Libreboot 20241008 release. Since Libreboot 20241206 is a stable release, there has been a more conservative focus on fixing bugs and in general polishing, though several interesting features have been added, in addition to numerous new mainboards.

The following boards have been added since the Libreboot 20241008 release:

• Lenovo ThinkPad T480 support, implemented by Mate Kukri with testing and hardware logs provided by Leah Rowe. - You can also buy T480 with Libreboot pre-installed
• Lenovo ThinkPad T480S support, implemented by Mate Kukri with testing and hardware logs provided by Leah Rowe. - You can also buy T480s with Libreboot pre-installed
• Dell OptiPlex 780 USFF support, implemented by Nicholas Chin with testing and hardware logs provided by Lorenzo Aloe.
• Dell OptiPlex 780 MT support, implemented by Nicholas Chin with testing and hardware logs provided by Lorenzo Aloe.

In descending order from latest changes to earliest changes:

• Updated to Mate Kukri’s rewritten release of deguard, which now works generally for any MEv11-based board, whereas the previous version contained hacky hardcoded logic for only the Dell OptiPlex 3050 Micro. In this Libreboot release, deguard supports the 3050, but also the ThinkPad T480 and T480S, providing machine-specific ME configurations for each mainboard. Mate’s new deguard implementation essentially does the same thing as Intel’s FITC tool, though with a much more terse and minimalist design. It could be expanded for many other things in the future, related to Intel ME.
• Updated U-Boot to v2024.10 release on ARM64 - and also added this revision for x86 coreboot payloads, to provide UEFI on 64-bit x86 machines. The ARM64 coreboot payload is maintained by Alper Nebi Yasak, and the x86 coreboot payload is principally maintained by Simon Glass.
• Updated the Dell OptiPlex 3050 Micro port to use a newer coreboot revision, which includes a fix adding PWM fan control, among other things. NOTE: This was later obsoleted, because OptiPlex 3050 Micro support was merged upstream and Libreboot switched to the upstream revision instead of Gerrit.
• Updated SeaBIOS to latest revision as of 17 October 2024.
• Bumped flashrom to revision d128a0a, which includes a fix for Macronix flash chips on ThinkPad W500 whereby it had previously used incorrect erase commands.

In descending order from latest changes to earliest changes:

• Implemented an auto-boot timeout on U-Boot payloads, for both ARM and x86. This is implemented in the bootflow menu, so that the system will auto-boot what is found after a few seconds. Previously, the user had to press enter, making headless operation impractical. If the countdown is interrupted with a keypress, it is disabled until the next reboot. The current countdown delay is 8 seconds, though the U-Boot patch sets a default of 30, which Libreboot then overrides via defconfig option.
• rom.sh: Support creating SeaUBoot payload setups. This is where SeaBIOS loads U-Boot from SeaBIOS first, unless interrupted by the ESC menu, whereby the user can select an alternative option, such as direct device booting from SeaBIOS, or the GRUB payload instead. This was done, to mitigate potential instability in U-Boot, since U-Boot is much more heavily tested so it provides a sensible fallback just in case. This could also be regarded as a preventative bug fix, from the perspective of a user.
• Experimental U-Boot payload on both 32- and 64-bit x86 setups. The 64-bit payload is chainloaded from SeaBIOS and the 32-bit one from GRUB. This is useful for booting BSD systems; for example, GPT partitioned OpenBSD can be booted with U-Boot, whereas the SeaBIOS payload would require MBR partitioning.
• Imported Riku Viitanen’s int tool, which was used for debugging MXM handling on the HP EliteBook 8560w port; the MXM is a data section provided by the system BIOS on mobile systems that use MXM graphics cards. The data describes ports, power management and so on. This was needed to make MXM cards work reliably.
• Imported Riku Viitanen’s gpio-scripts fork, which parses inteltool output for providing GPIO configuration on new coreboot ports; note that from Skylake onward, intelp2m is used instead, but Libreboot does not directly import the intelp2m utility (it is included via coreboot instead).
• Imported Riku Viitanen’s mxmdump utility, for extracting MXM configuration on mobile graphics cards. This was used when implementing MXM support on the HP EliteBook 8560w.

In descending order from the latest changes to the earliest changes:

• Disabled U-Boot on ThinkPad T480, because it’s currently buggy there; more boards will have U-Boot tweaks made to them, in subsequent hotfixes to the Libreboot 20241206 release, and hotfixes to U-Boot itself are also likely, since U-Boot still requires a lot more testing. U-Boot does work quite well on a number of tested mainboards; if yours works, or doesn’t work, please get in touch with the Libreboot project, so that a tally can be kept.
• Added Libreboot branding/versioning to the U-Boot bootflow menu, showing the Libreboot logo instead of the U-Boot one, and with a purple background colour in the console, matching the style used by Libreboot.
• U-Boot (ARM): Alper Nebi Yasak enabled USE with a preboot command at startup. This is so that USB keyboards and external disks can be used during the boot process; this would have been previously enabled much later in the boot process.
• Enabled the coreboot serial console on these targets: Thinkpad X60, HP Elite 8200 SFF, HP EliteBook 8460p, HP EliteBook 8560w.
• Enabled U-Boot x86 payload on almost every coreboot board; basically, all of the ones with a native coreboot framebuffer (libgfxinit).
• Removed coreboot/dell7 (for 3050 Micro) and merged it into a new tree, coreboot/next instead, which was (for this release) later updated to the latest coreboot revision from a few days prior to the release. The next branch contains OptiPlex 780 ports and the Kaby Lake machines such as OptiPlex 3050 Micro or ThinkPad T480/T480S.
• Removed the FSP submodule from coreboot/default, because it’s currently used in coreboot/next instead (for Kaby Lake machines).
• Enabled support in coreboot, on Dell OptiPlex 3050 Micro, for Coffee Lake CPUs. With a special pin mod (currently untested as of 6 December 2024), Kaby Lake machines can make use of 8th-gen Coffee Lake CPUs, which offer greater performance and power efficiency.

The following bug fixes have been merged (in descending order from the latest changes to the earliest changes):

• script/trees: Reset the PATH environmental variable per target, to what it was when the script was first called. This is because PATH is manipulated when dealing with crossgcc, exporting it prior to running a given build process, if the current project/target enables cross compilation. This bug didn’t cause any issues in practise, so this is a preventative bug fix, because projects that use the crossgcc compiler all set xarch properly, and none of the projects that aren’t cross compiled use special prefixes in their toolchain references, at least as of 6 December 2024.
• Add U-Boot first, on x86 coreboot targets, even though it doesn’t execute first, because U-Boot has to be inserted at a specific offset. This avoids potential overlap errors in cbfstool, if it were to be added later on. This bug didn’t cause any issues in practise, so it is theoretical in nature and therefore a preventative bug fix.
• rom.sh: Removed redundant shebang, which didn’t technically cause any problems, but it’s technically a bug since this is not provided as a main script, and must never be executed directly, instead only to be executed by other scripts.
• Added missing openssl-devel-engine to Fedora 41 build dependencies.
• U-Boot: Merged an x86 patch from Simon Glass, that makes U-Boot skip clearing the VESA display an startup, since this is already done by the VESA driver. In some cases, you may want to keep what was previously on the screen, like for logos and such. We currently do not use U-Boot on VESA setups in Libreboot, as of 6 December 2024.
• U-Boot: Merged an x86 patch from Simon Glass, that makes U-Boot silently disable serial console output, where one is not available; previously, it would crash if one wasn’t available, on x86 machines.
• script/trees: Unset the CROSS_COMPILE environmental variable, to fix an issue whereby projects that honour it might be wrongly cross compiled where a previous export of that variable was made; for example, setting it on arm64 U-Boot and then compiling x86 U-Boot, where the latter currently relies on the host’s x86_64 toolchain, on an x86_64 host.
• Enabled the legacy 8254 timer on Dell OptiPlex 3050 Micro, to work around a hanging bug in SeaBIOS. This board was previously GRUB only, but now once again uses a more flexible SeaGRUB setup like other mainboards do. The static option table was also disabled.
• Merged a patch from Nicholas Chin, that tells the MEC5035 EC to send a correct shutdown signal to the operating system when the power button is pressed. Prior to this fix, pressing the power button on Dell Latitude laptops would result in the system turning off, but the OS would be unaware of this fact so file systems (for example) would not be cleanly unmounted.
• Merged a patch from Mate Kukri, fixing PWM fan controls on the Dell OptiPlex 3050 Micro. Previously, the fans always ran at a very low speed even under stress conditions, leading to over-heating; the system now runs reliably.
• Removed end slashes in repository links within config/git, because of how caching works in Libreboot; fewer projects now fail to cache, making the download process more redundant and fault tolerant at build time when downloading upstream sources.
• vendor.sh: Don’t use the x_ wrapper for handling errors while changing GbE MAC addresses, because a file path is provided as argument, and the x_ wrapper currently does not handle globbing; instead, the $err function is used for returning error status.
• vendor.sh: Properly handle error status when returning from deguard’s RUNME script (This change was later obsoleted when deguard was rewritten, and Libreboot imported the newly rewritten version - the new code and handling of it is much more robust)
• Added missing python3-devel to Fedora 40 build dependencies.

In descending order from the latest changes to the earliest changes:

• Removed unnecessary coreboot submodule configs, for trees that no longer exist such as coreboot/haswell or coreboot/dell7.
• Removed the following unnecessary coreboot patches in the default tree: VRAM patches (VRAM allocation is dynamic in modern OSes, so the fixed higher size merely wastes system RAM needlessly on Intel GPUs when not a lot of VRAM is needed). Removed redundancy patches for coreboot’s buildgcc download logic, because lbmk now handles this outside of coreboot.

This log is relative to Libreboot 20241008:

* 07983c1d882 Revert "Revert "disable u-boot on thinkpad t480"" 
* 19ec440a6f7 Revert "disable u-boot on thinkpad t480" 
* 99513c3bf67 add patch from mkukri fixing t480 sata 
* cd9baca5d66 disable u-boot on thinkpad t480 
* 8065b9842b5 remove the purple patch on arm64 u-boot 
*   5cc91d8e40a Merge pull request 'u-boot: Use bootflow menu by default for ARM64 boards' (#254) from alpernebbi/lbmk:u-boot-arm64-bootflow-menu into master 
|\  
| * f26752fd854 u-boot: Use bootflow menu by default for ARM64 boards 
* | bef2890233e i made u-boot purple 
|/  
* 965f9bd0335 Add bootflow/branding patches to arm64 U-Boot too 
* 44e6a0c0905 Add libreboot branding/version to U-Boot bootflow 
* c038b653ac1 Add auto-boot timeout for U-Boot's bootflow menu 
* 7a6e47c24fe 8-sec auto-boot timeout for U-Boot's bootflow menu 
* 90850eb859c fix board name for coreboot/dell7010sff 
* 8314fbc67eb add /dump/ to .gitignore 
* efebfa992b6 Revert "trees: Allow using a custom clean command" 
* 5b4c9158e5a trees: Allow using a custom clean command 
* b95a411a364 Add SPD support for onboard ThinkPad T480S RAM 
* 046529abd98 Disable m2 caddy hotplug on T480S 
* 9dc3c86ae37 vendor.sh: Remove T480 VGA ROM download handling 
* 33efe45b149 Enable legacy 8254 timer on ThinkPad T480 
* cde9594aab5 libgfxinit on Thinkpad T480 
* c1b73269726 NEW MAINBOARD: ThinkPad T480S 
* 264928c6cde NEW MAINBOARD: ThinkPad T480 
*   597b45fdbd5 Merge pull request 'Update U-Boot to v2024.10' (#253) from alpernebbi/lbmk:uboot-v2024.10 into master 
|\  
| * 3dd77b33a72 u-boot: Enable USB with a preboot command 
| * ba772eb6acd u-boot: Update ARM64 boards to v2024.10 
* | 28d8dc93a52 vendor.sh: Use the new deguard for 3050micro 
* | 7f6e47d27c6 trees: reset PATH per-target 
|/  
* f4b6aeea281 rom.sh: Add U-Boot before SeaBIOS and GRUB (x86) 
* 7014b303f98 rom.sh: Remove unnecessary shebang 
*   a3accd39a06 Merge pull request 'config/deps/fedora41: Add openssl-devel-engine to dependency list' (#251) from mkukri/lbmk:master into master 
|\  
| * 98c5e436282 config/deps/fedora41: Add openssl-devel-engine to dependency list 
|/  
* ef7db205463 e6400nvidia: Disable U-Boot 
* eea9fc40975 rom.sh: unset displaymode on normal initmode 
* f312e6026f9 rom.sh: Don't build U-Boot on normal initmode 
* 587d588fe4c rom.sh: Don't build txtmode U-Boot images 
* 7d1fd1cc6a1 rom.sh: Support SeaUBoot for 64-bit x86 U-Boot 
* 02e66ae01ae U-Boot x86: Avoid clearing the VESA display 
* 32dced8cd83 disable U-Boot for now on HP EliteBook 8560w 
* a68b468964d enable serial debug on HP EliteBook 8460p 
* b79bd736e70 enable serial debug on hp elite 8200 sff 
* b109617752f enable the serial console on thinkpad x60 
* 0c7fb21a062 enable the serial console on thinkpad t60 
* eb14a176bc8 Only boot 32-bit u-boot from grub, 64 from seabios 
* 279e69172f7 make the u-boot grub menuentry more useful 
* fdbdf0449b3 Re-enable U-Boot x86 on real mainboards 
* b549d1e5f38 u-boot x86 serial/ns16550: disable UART as needed 
* eba73c778a8 Disable U-Boot x86 except on Qemu 
* 4bc6ca545e7 fix U-Boot hotkey mention in grub.cfg 
* 6d629a8496c Update x86 U-Boot to v2024.10 (was v2024.07) 
* 709bbebdcf2 grub.cfg: mark U-Boot as experimental in the menu 
* 637c0a1521a trees: unset CROSS_COMPILE per target 
* f13819386bf Enable x86 U-Boot payload on every x86 board 
* 747b6514eaf Add U-Boot x86_64 payload 
* 3bf3ef557e4 add arm-none-eabi-gcc-cs-c++ to fedora dependency 
* 2deab8572db clean up the coreboot submodules 
* 9abddb82b92 Bump coreboot/next and merge coreboot/dell7 
* 8c4cacba27c data/coreboot: add missing variable 
* cdd8cb9086f coreboot/default: remove unnecessary module 
* c0017c73578 Experimental U-Boot payload (32-bit dtb, U-Boot) 
* 14b4838d495 coreboot/default: Re-base all patches 
* 67c92889a86 NEW MAINBOARD: Dell OptiPlex 780 USFF 
* 38006cb2bc0 coreboot/dell3050micro: enable coffeelake CPUs 
* 97054498e94 NEW MAINBOARD: Dell OptiPlex 780 MT 
* f3170fb06eb coreboot/dell7: add missing ifdtool nuke patch 
* 19795bf980e re-update seabios to latest revision 
* 9bdec645a30 3050micro: Re-enable SeaGRUB 
*   6c78942290d Merge pull request 'config/coreboot/default: Update MEC5035 patches' (#244) from nic3-14159/lbmk:mec5035-updates into master 
|\  
| * b257662e55c config/coreboot/default: Update MEC5035 patches 
* | 237fa1e3c18 3050micro: don't set static option table 
* | d1743d1f647 3050micro: Use alt century byte +legacy 8254 timer 
* | c56f6987139 Use SeaBIOS 1.16.3 and enable debugging 
* | d8ac9d53b66 Switch Dell 3050 Micro to newer coreboot revision 
|/  
* 99a88ebfa20 Update dell 3050 patch to patch 15 (pwm fix) 
* 3f63c6d12f6 rom.sh: remove unnecessary logic from copyps1bios 
* 56495c61e6c use redundant mirrors for recent utils imports 
* 38d37a340fb remove end slashes on repos in config/git/ 
* 6eb2e98c0f0 import Riku's int tool 
* 441d21dc134 import Riku's gpio-scripts 
* e8957b0833a import Riku's mxmdump utility 
* 91a26ec3611 bump seabios 
* 34f851742e1 vendor.sh: Don't use x_ for image MAC address mod 
* c7a3a607f3d bump flashprog revision to d128a0a 
* 3b92b7b7236 vendor.sh: Handle error status on RUNME.sh 
* 147e0343416 dependencies/fedora40: add python3-devel 

This accounts for 79 changes made, relative to Libreboot 20241008. Many changes were intentionally delayed because this is to be a stable release. A lot of new work will now go into the next testing release, which is scheduled for the latter part of January 2025 or early February 2025.

If you spot any issues in the Libreboot 20241206 release, please do get in contact with the Libreboot project. We appreciate any and all help. Thank you for reading, and have a wonderful day!

Several revisions have been made to this release, since the original release. With stable releases, it’s normal to make such revisions, when critical bugs are discovered, or desirable changes are otherwise identified.

When these changes are made, the release is re-compiled, with the newly amended binaries and sources re-uploaded, replacing what was there before. Individual patch files are also provided, so that you can (using them as reference) revert the source archive back to previous revisions.

Please see: Libreboot 20241206 release revisions

Many revisions are planned in the run-up to next year’s stable release ETA Summer of 2025. In particular, there is much work that still needs to be done on the U-Boot payloads (x86 and ARM64).

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