coreboot

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

Reproducible Coreboot

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!

128 (100.0%) out of 128 built coreboot images were reproducible in our test setup ! These tests were last run on 2025-04-18 for version 25.03-228-g4c22c3d83e using diffoscope 294.

variationfirst buildsecond build
hostname osuosl1-amd64 or osuosl2-amd64the other one
domainname is not yet varied between rebuilds of coreboot.
env CAPTURE_ENVIRONMENTnot setCAPTURE_ENVIRONMENT="I capture the environment"
env TZTZ="/usr/share/zoneinfo/Etc/GMT+12"TZ="/usr/share/zoneinfo/Etc/GMT-14"
env LANGLANG="en_GB.UTF-8"LANG="et_EE.UTF-8"
env LC_ALLnot setLC_ALL="et_EE.UTF-8"
env PATHPATH="/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-2.6Linux 6.12.12+bpo-amd64Linux 2.6.72+bpo-amd64
umask00220002
CPU type AMD Opteron(tm) Processor 4284same for both builds
/bin/sh is not yet varied between rebuilds of coreboot.
year, month, datetoday (2025-04-18)same for both builds (currently, work in progress)
hour, minutehour and minute will probably vary between two builds...the future system actually runs 398 days, 6 hours and 23 minutes ahead...
Filesystemtmpfssame 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 4c22c3d83e7fa68e706f4533685e983583c56b53
Author: Jarried Lin 
Date:   Tue Apr 15 13:35:54 2025 +0800

    soc/mediatek/mt8196: Add DCC driver support in ramstage
    
    Duty Cycle Correlation (DCC) analyzes and optimizes the relationship
    between the duty cycles of multiple signals. This commit implements DCC
    driver support to improve clock signals, power management, and
    communication systems, enhancing system stability and performance.
    These improvements will become more significant as the SoC ages.
    
    BUG=b:389784352
    BRANCH=rauru
    TEST=Build pass, check dcc log:
    [DEBUG]  [DCC] DSU=0x0, LCPU=0x0, MCPU=0x17, BCPU=0x1b
    
    Change-Id: I77e5cd951f45dad7a6e2e77c135b821e4179e019
    Signed-off-by: Jarried Lin 
    Reviewed-on: https://review.coreboot.org/c/coreboot/+/87320
    Reviewed-by: Paul Menzel 
    Reviewed-by: Yidi Lin 
    Tested-by: build bot (Jenkins) 
    Reviewed-by: Yu-Ping Wu

cross toolchain sourcesha256sum
acpica-unix-20241212.tar.gz 9dca83cfee390b710485fbdf787048370049c05723b10cc220cfef6e13c31961
binutils-2.43.1.tar.xz 13f74202a3c4c51118b797a39ea4200d3f6cfbe224da6d1d95bb938480132dfd
gcc-14.2.0.tar.xz a7b39bc69cbf9e25826c5a60ab26477001f7c08d85cec04bc0e29cabed6f3cc9
gmp-6.3.0.tar.xz a3c2b80201b89e68616f4ad30bc66aee4927c3ce50e33929ca819d5c43538898
mpc-1.3.1.tar.gz ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8
mpfr-4.2.1.tar.xz 277807353a6726978996945af13e52829e3abd7a9a5b7fb2793894e18f1fcbb2
Debian 12.10 package on amd64installed version
gcc 4:12.2.0-3
g++ 4:12.2.0-3
make 4.3-4.1
cmake 3.25.1-1
flex 2.6.4-8.2
bison 2:3.8.2+dfsg-1+b1
pkg-config 1.8.1-1

There is more information about jenkins.debian.net and about reproducible builds of Debian available elsewhere.
Please send technical feedback about this setup to the Debian jenkins development list, or as a bug report against the jenkins.debian.org package. Feedback about specific job results should go to their respective lists and/or the BTS.
The code of jenkins.debian.net is mostly GPL-2 licensed. The weather icons are public domain and were taken from the Tango Icon Library. Copyright 2014-2024 Holger Levsen and many others.
Last update: 2025-04-18 13:42 UTC