Reproducible coreboot (original) (raw)

coreboot

coreboot™: fast, flexible and reproducible Open Source firmware!

Reproducible builds enable anyone to reproduce bit by bit identical binary packages from a given source, so that anyone can verify that a given binary derived from the source it was said to be derived. There is more information about reproducible builds on the Debian wiki and on https://reproducible-builds.org. These pages explain in more depth why this is useful, what common issues exist and which workarounds and solutions are known.

Reproducible Coreboot is an effort to apply this to coreboot. Thus each coreboot.rom is build twice (without payloads), with a few variations added and then those two ROMs are compared using diffoscope. Please note that the toolchain is not varied at all as the rebuild happens on exactly the same system. More variations are expected to be seen in the wild.

There is a weekly run jenkins job to test the master branch of coreboot.git. The jenkins job is running reproducible_coreboot.sh in a Debian environment and this script is solely responsible for creating this page. Feel invited to join #reproducible-builds (on irc.oftc.net) to request job runs whenever sensible. Patches and other feedback are very much appreciated - if you want to help, please start by looking at the ToDo list for coreboot, you might find something easy to contribute.
Thanks to IONOS for donating the virtual machines this is running on!

174 (100.0%) out of 174 built coreboot images were reproducible in our test setup ! These tests were last run on 2026-06-17 for version 26.03-1125-g69be07fac7 using diffoscope 319.

variation first build second build
hostname osuosl1-amd64 or osuosl2-amd64 the other one
domainname is not yet varied between rebuilds of coreboot.
env CAPTURE_ENVIRONMENT not set CAPTURE_ENVIRONMENT="I capture the environment"
env TZ TZ="/usr/share/zoneinfo/Etc/GMT+12" TZ="/usr/share/zoneinfo/Etc/GMT-14"
env LANG LANG="en_GB.UTF-8" LANG="et_EE.UTF-8"
env LC_ALL not set LC_ALL="et_EE.UTF-8"
env PATH PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:" PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path"
env USER is not yet varied between rebuilds of coreboot.
uid is not yet varied between rebuilds of coreboot.
gid is not yet varied between rebuilds of coreboot.
UTS namespace is not yet varied between rebuilds of coreboot.
kernel version, modified using /usr/bin/linux64 --uname-2.6 Linux 6.12.90+deb13.1-amd64 Linux 2.6.72+deb13.1-amd64
umask 0022 0002
CPU type Intel Xeon Processor (Cascadelake) same for both builds
/bin/sh is not yet varied between rebuilds of coreboot.
year, month, date today (2026-06-17) same for both builds (currently, work in progress)
hour, minute hour and minute will probably vary between two builds... the future system actually runs 398 days, 6 hours and 23 minutes ahead...
Filesystem tmpfs same for both builds (currently, this could be varied using disorderfs)
everything else... is likely the same. There will be more variations in the wild.

commit 69be07fac797cadd410f56efb06c58a6d7ea722e Author: Jan Philipp Groß jeangrande@mailbox.org Date: Tue Jun 16 14:08:14 2026 +0200

mb/asus: Maximus VI/VII series: update hda_verb.c

Replace the numbers in hda_verb.c with human-readable descriptions.
The new format was obtained by running hda-decoder.

Change-Id: I6715655aed378269e42a5bda04a5d1f191f5976e
Signed-off-by: Jan Philipp Groß <jeangrande@mailbox.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/93525
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Nicholas <nic.c3.14@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>     </no-reply@coreboot.org></nic.c3.14@gmail.com></service+coreboot-gerrit@felixsinger.de></jeangrande@mailbox.org></jeangrande@mailbox.org>
cross toolchain source sha256sum
acpica-unix-20251212.tar.gz 486423245f8154dd0bb5ada9ae057d670210dcbbc4386e62aeccdf5bfdad5f19
binutils-2.45.1.tar.xz 5fe101e6fe9d18fdec95962d81ed670fdee5f37e3f48f0bef87bddf862513aa5
gcc-15.2.0.tar.xz 438fd996826b0c82485a29da03a72d71d6e3541a83ec702df4271f6fe025d24e
gmp-6.3.0.tar.xz a3c2b80201b89e68616f4ad30bc66aee4927c3ce50e33929ca819d5c43538898
mpc-1.3.1.tar.gz ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8
mpfr-4.2.2.tar.xz b67ba0383ef7e8a8563734e2e889ef5ec3c3b898a01d00fa0a6869ad81c6ce01
Debian 13.5 package on amd64 installed version
gcc 4:14.2.0-1
g++ 4:14.2.0-1
make 4.4.1-2
cmake 3.31.6-2
flex 2.6.4-8.2+b4
bison 2:3.8.2+dfsg-1+b2
pkg-config 1.8.1-4