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!

119 (100.0%) out of 119 built coreboot images were reproducible in our test setup ! These tests were last run on 2024-10-30 for version 24.08-554-gbc8cc46055 using diffoscope 282.

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 6.10.11+bpo-amd64Linux 2.6.70+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 (2024-10-30)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 bc8cc460550364c16ae00b00e19fd8c033ec175c
Author: Subrata Banik 
Date:   Tue Oct 29 02:11:56 2024 +0530

    soc/intel/pantherlake: Populate and pass DRAM info for SMBIOS
    
    This patch implements the `save_dimm_info()` API to populate and pass
    DRAM-related information to the next stage. This information
    is used to generate the SMBIOS memory table, providing details about
    installed DIMMs.
    
    This addresses the issue where SMBIOS lacked detailed DIMM information.
    
    Verified that `dmidecode` correctly dumps the DIMM information from the
    SMBIOS table after this change.
    
    BUG=b:376103463
    TEST=Built and booted successfully. Verified DIMM info in SMBIOS using
    `dmidecode`.
    
    > dmidecode -t 17
    
    ```
    Getting SMBIOS data from sysfs.
    SMBIOS 3.0 present.
    
    Handle 0x000B, DMI type 17, 40 bytes
    Memory Device
            Array Handle: 0x000A
            Error Information Handle: Not Provided
            Total Width: 16 bits
            Data Width: 16 bits
            Size: 2 GB
            Form Factor: Row Of Chips
            Set: None
            Locator: Channel-0-DIMM-0
            Bank Locator: BANK 0
            Type: LPDDR5
            Type Detail: Unknown Synchronous
            Speed: 6400 MT/s
            Manufacturer: Hynix
            Serial Number: 00000000
            Asset Tag: Channel-0-DIMM-0-AssetTag
            Part Number: H58G56BK7BX068
            Rank: 1
            Configured Memory Speed: 6400 MT/s
            Minimum Voltage: 0.5 V
            Maximum Voltage: 0.5 V
            Configured Voltage: 0.5 V
    ...
    ...
    
    Handle 0x0012, DMI type 17, 40 bytes
    Memory Device
            Array Handle: 0x000A
            Error Information Handle: Not Provided
            Total Width: 16 bits
            Data Width: 16 bits
            Size: 2 GB
            Form Factor: Row Of Chips
            Set: None
            Locator: Channel-3-DIMM-0
            Bank Locator: BANK 0
            Type: LPDDR5
            Type Detail: Unknown Synchronous
            Speed: 6400 MT/s
            Manufacturer: Hynix
            Serial Number: 00000000
            Asset Tag: Channel-3-DIMM-0-AssetTag
            Part Number: H58G56BK7BX068
            Rank: 1
            Configured Memory Speed: 6400 MT/s
            Minimum Voltage: 0.5 V
            Maximum Voltage: 0.5 V
            Configured Voltage: 0.5 V
    ```
    
    Change-Id: I3b942610272de401589ee0463de9cd0985974774
    Signed-off-by: Subrata Banik 
    Reviewed-on: https://review.coreboot.org/c/coreboot/+/84903
    Tested-by: build bot (Jenkins) 
    Reviewed-by: Pranava Y N 
    Reviewed-by: Kapil Porwal

cross toolchain sourcesha256sum
acpica-unix-20230628.tar.gz 86876a745e3d224dcfd222ed3de465b47559e85811df2db9820ef09a9dff5cce
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 12.7 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: 2024-10-30 14:38 UTC