Coreboot: Difference between revisions

From NixOS Wiki
imported>Milahu
m make menuconfig -> dark mode
imported>Milahu
m remove "this can take some hours" - it does not, when we build only one toolchain
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# configure
# configure
# set mainboard model, chip size, ...
# set mainboard model, chip size, ...
make menuconfig MENUCONFIG_COLOR=blackbg
make menuconfig MENUCONFIG_COLOR=blackbg # blackbg = dark mode


# build toolchain
# build toolchain for a 64 bit target
# this can take some hours
# list all targets: make help
# list all targets: make help
make crossgcc-x64 CPUS=$(nproc)
make crossgcc-x64 CPUS=$(nproc)


# build firmware
# build firmware
make
make CPUS=$(nproc)


# test firmware
# test firmware

Revision as of 22:03, 30 October 2021

Building in nix-shell

To build your own coreboot bios:

Create a shell.nix, and run nix-shell

# shell.nix

# NOTE we need mkShellNoCC
# mkShell would add the regular gcc, which has no ada (gnat)
# https://github.com/NixOS/nixpkgs/issues/142943

with import <nixpkgs> { };
mkShellNoCC {
  buildInputs = [
    gnat11 # gcc with ada
    #gnatboot # gnat1
    ncurses # make menuconfig
    #flex bison # Generate flashmap descriptor parser
    #clang
    zlib
    #acpica-tools # iasl
    pkgconfig
    qemu # test the image
  ];
  shellHook = ''
    # TODO remove?
    NIX_LDFLAGS="$NIX_LDFLAGS -lncurses"
  '';
}

Now we can build coreboot:

git clone https://review.coreboot.org/coreboot.git --depth 1
cd coreboot
du -sh . # 200 MByte
git submodule update --init --checkout --depth 1
du -sh . # 700 MByte

# configure
# set mainboard model, chip size, ...
make menuconfig MENUCONFIG_COLOR=blackbg # blackbg = dark mode

# build toolchain for a 64 bit target
# list all targets: make help
make crossgcc-x64 CPUS=$(nproc)

# build firmware
make CPUS=$(nproc)

# test firmware
qemu-system-x86_64 -bios build/coreboot.rom -serial stdio

Skip building toolchain

We can use our system toolchain to build coreboot firmware, but this is not recommended per coreboot docs:

you can possibly use your system toolchain, but the results are not reproducible, and may have issues, so this is not recommended

To use the system toolchain, in make menuconfig, enable General Setup > Allow building with any toolchain

Building as derivation

coreboot is pretty picky about the toolchain it is built with and thus using the toolchain it comes with is the easiest path to success. There are commented Nix expressions that build coreboot here.

See also