Article published by: Leah Rowe
Date of publication: 25 June 2023
IMPORTANT ADVICE: PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING/UPDATING LIBREBOOT.
Libreboot provides boot firmware for supported x86/ARM machines, starting a bootloader that then loads your operating system. It replaces proprietary BIOS/UEFI firmware on x86 machines, and provides an improved configuration on ARM-based chromebooks supported (U-Boot bootloader, instead of Google’s depthcharge bootloader). On x86 machines, the GRUB and SeaBIOS coreboot payloads are officially supported, provided in varying configurations per machine. It provides an automated build system for the configuration and installation of coreboot ROM images, making coreboot easier to use for non-technical people. You can find the list of supported hardware in Libreboot documentation.
Libreboot’s main benefit is higher boot speed, better security and more customisation options compared to most proprietary firmware. As a libre software project, the code can be audited, and coreboot does regularly audit code. The other main benefit is freedom to study, adapt and share the code, a freedom denied by most boot firmware, but not Libreboot! Booting Linux/BSD is also well supported.
This new release, Libreboot 20230625, released today 25 June 2023, is a new stable release of Libreboot. The previous stable release was Libreboot 20220710, released on 10 July 2022.
The changes listed here are relative to Libreboot 20230423, not 20220710. Therefore, to get a full list of changes since 20220710 (the previous stable release, where releases in-between then and now were testing), you should read the 20221214, 20230319, 20230413 and 20230423 announcements before reading the 20230625 change log, in order to get a complete picture.
This release was build-tested on Debian Sid, as of 25 June 2023. Your mileage may vary, with other distros. Refer to Libreboot documentation.
These boards were added to Libreboot:
The focus has been on stability, auditing the build system and fixing bugs, thus hardware support is not greatly improved since the last release. Moving forward, the next Libreboot release will be a testing release and will focus on hardware support in addition to payloads (linux boot, UEFI etc).
Since Libreboot 20221214 and up, CPU microcode is included by default on all applicable x86 mainboards. However, Libreboot provided (and still provides) documentation for how to manually remove it.
Such removal is still possible, but this release now provides two sets of ROM images for each x86 mainboard: one set of ROMs will contain CPU microcode, and another set excludes them. For more context, see Binary Blob Reduction Policy and Freedom Status.
An earlier article was written about this, here
The full change log below will list all build system changes, but may not provide the overall picture, so to be clear: the Libreboot build system has undergone an intense audit since the last release. Over half of it has been re-written, or heavily re-factored. The logic is much cleaner now (better coding style, based on the OpenBSD coding style) and many bugs are fixed.
An earlier article was written about this, here
Certain build system changes will not be listed here in detail, if they pertain to general code style cleanup/re-factoring, as already alluded to in the section above. However, specific bug fixes will be listed here, some of which are also referenced in the article linked above.
Newest changes first, oldest changes last:
cbutils/ from the main lbmk directory. Use these binaries during build (ROM images, for example). this makes handling of coreboot more robust, where we can now run
make distclean without worrying about utilities. This also fixes the bug where utilities were being needlessly re-compiled, slowing down the build of multiple ROM images.
cros: Disable coreboot-related BL31 features. This fixes poweroff on gru chromebooks. Patch courtesy of Alper Nebi Yasak.
u-boot: Increase EFI variable buffer size. This fixes an error where Debian’s signed shim allocates too many EFI variables to fit in the space provided, breaking the boot process in Debian. Patch courtesy Alper Nebi Yasak
nyan chromebooks: Removed for now (not yet stable) - this release only contains
gru chromebooks, where ARM-based chromebooks are concerned.
blobutil/download: Exit with zero status (success) immediately, when no board configs exist for a specified target. This fixes the
./build boot roms all command, when the relevant script encounters certain targets defined under
resources/coreboot, where previously the command would fail due to implicit references to such files.
lbmk script: Exit non-zero if a called script fails, explicitly. The script previously relied on
-e which isn’t always completely reliable. The new handling also explicitly prints
lbmk error on stdout, to let the operator know that an error did in fact occur.
t440p_12mb renamed to
build/boot/roms: No-microcode ROM images provided, alongside the default ROMs that include microcode by default. This change is also alluded to in the sections above.
blobutil/download: Cache downloads based on checksum, to avoid needlessly re-downloading files per mainboard. This is useful when compiling multiple ROM images, for multiple mainboards. Patch courtesy Riku Viitanen.
util/nvmutil: Vastly more efficient code (part of the audit, referenced in above).
util/nvmutil: unveil now used, in addition to pledge when compiled on OpenBSD.
util/nvmutil: Hardened pledge calls, when compiled on OpenBSD.
hp8200sff: Add 4MB ROM configs, for internal flashing, patch courtesy of Riku Viitanen.
download/coreboot fix: Do not needlessly re-download a given coreboot tree, if it was already downloaded.
build/release/roms: Fix error handling inside subshells.
build/release/src: Fix error handling, previously not handled inside subshells.
build/ich9utils: Fix error handling (subshells)
build/descriptors: Fixed error handling (certain errors weren’t handled)
build/grub: Actually handle errors. Logic was handled in subshells, where greater care is required for error handling. Exit with non-zero status upon any error.
gitclone: Only delete the old project directory if the new download has succeeded, to avoid, for example, complete purging of files when your internet is down. In such cases, it’s better that the script simply fails and no action is taken. This fix implements such caution.
blobutil fix: Actually exit with non-zero status (fail) when a called script fails. This previously wasn’t done at all.
.gitcheck (script): Another bug fix, actually do clean coreboot git credentials, when temporary ones were set, per coreboot tree. This previously was not handled at all. (this script removes the need to manually set git name/email, by setting a temporary one which makes the coreboot build system happy when building ROM images)
.gitcheck (script): Actually run gitcheck-clean. It wasn’t being executed at all, which screwed up the user’s git credentials in some cases (after running lbmk, you would sometimes commit a patch and find that your name is now lbmkplaceholder).
util/spkmodem_recv: Also: DEBUG define no longer used. It is now an argument namely
-d, which can be passed to the program. The code for debug is now present in any build. Usage:
util/spkmodem_recv - imported from coreboot, which in turn forked it originally from GNU GRUB. This is a receiving client for spkmodem, a type of serial console provided via pulses over PC speaker. Libreboot’s version greatly improves the error handling, and it has been re-factored for OpenBSD coding style, to replace the (very horrible) GNU coding style. It is also pledged in Libreboot’s version. For reference, here is the GNU version, and here is coreboot’s version of it. And now to blow your mind, here is the Libreboot version present in release 20230625. A very much GNU program, but you wouldn’t know it by looking! This fork was mostly done for fun, very much a because we can affair. BONUS: BSD-style error handling (
extra.sh directly from the directory for the given coreboot tree, if the script exists. No board in Libreboot has ever included an
extra.sh script, but it can be used to extend the default functionality of lbmk where lots of custom logic is needed for a given board. For example, if you needed to apply lots of patches from gerrit in a specific order, in a way that could not be generalised for other mainboards where it’s really only applicable to that mainboard, you might use
extra.sh. This was briefly used in the erstwhile osboot project, on a few boards.
gitclone script for actually cloning coreboot, while still using the main script for handling trees/revisions and such. (this is one of the scripts that got re-written during the audit, mentioned in the previous section above)
* will error out if no files exist.
gnulib fails, scrap the grub download aswell, and exit with non-zero status (fail). This is done because gnulib is a dependency of GRUB.
gbe.bin, check that the file actually exists, and exit with non-zero status (fail) otherwise.
me.bin, check that the given path is defined and exit with non-zero status (fail) otherwise.
mrc.bin on Haswell ROM images (ThinkPad T440p/W541). Previously, lbmk would insert them based on the offset as per ROM image file size, but it is possible (and more reliable) to have cbfstool calculate that position within the file based on where the ROM image would be loaded into memory. The result is identical in practise (same checksum for the file), but this is more robust for a future scenario where, for example, Libreboot might provide different sized images. For example, if the flash were upgraded to 16MB rather than 12MB on a T440p (Libreboot still only provides 12MB images for T440p).
normal config for setups where no VGA ROM init from CBFS is provided, either in SeaBIOS or GRUB(via coreboot). This would be used, for example, on desktops that lack onboard graphics, where it is expected that a graphics card would be used.
bios_extract to work nicely with Dell E6400 update files, patch courtesy of Nicholas Chin.
bios_extract (used to VGA ROM from Dell updates, for Nvidia GPU model of Dell Latitude E6400, though this release only officially supports the Intel GPU variant)
All of the following are believed to boot, but if you have any issues, please contact the Libreboot project. They are:
You can find this release on the downloads page. At the time of this announcement, some of the rsync mirrors may not have it yet, so please check another one if your favourite one doesn’t have it.
When building ROM images from the release archives, the following error is observed in some cases, depending on distro:
In file included from src/lib/version.c:4:
build/build.h:10:32: error: 'libreboot' undeclared here (not in a function)
10 | #define COREBOOT_MAJOR_VERSION libreboot-20230625
src/lib/version.c:35:46: note: in expansion of macro 'COREBOOT_MAJOR_VERSION'
35 | const unsigned int coreboot_major_revision = COREBOOT_MAJOR_VERSION;
This happened when a user tried to build for ThinkPad W541 on an Arch Linux system. The fix is available here:
Apply this patch to your local release archive, and it should fix the issue.
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