nix-community/raspberry-pi-nix
1
0
Fork 0
mirror of https://github.com/nix-community/raspberry-pi-nix.git synced 2025-11-08 19:46:03 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

add docs for KUNIT setting

Browse source
This commit is contained in:
Travis Staton 2023-06-12 10:44:29 -04:00
parent 7c6fa52715
commit 92e2a3b15f
1 changed files with 17 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

17
overlay/default.nix
View file

@ -81,6 +81,23 @@ in
};
argsOverride = {
structuredExtraConfig = with prev.lib.kernel; {
# The perl script to generate kernel options sets unspecified
# parameters to `m` if possible [1]. This results in the
# unspecified config option KUNIT [2] getting set to `m` which
# causes DRM_VC4_KUNIT_TEST [3] to get set to `y`.
#
# This vc4 unit test fails on boot due to a null pointer
# exception with the existing config. I'm not sure why, but in
# any case, the DRM_VC4_KUNIT_TEST config option itself states
# that it is only useful for kernel developers working on the
# vc4 driver. So, I feel no need to deviate from the standard
# rpi kernel and attempt to successfully enable this test and
# other unit tests because the nixos perl script has this
# sloppy "default to m" behavior. So, I set KUNIT to `n`.
#
# [1] https://github.com/NixOS/nixpkgs/blob/85bcb95aa83be667e562e781e9d186c57a07d757/pkgs/os-specific/linux/kernel/generate-config.pl#L1-L10
# [2] https://github.com/raspberrypi/linux/blob/1.20230405/lib/kunit/Kconfig#L5-L14
# [3] https://github.com/raspberrypi/linux/blob/bb63dc31e48948bc2649357758c7a152210109c4/drivers/gpu/drm/vc4/Kconfig#L38-L52
KUNIT = no;
};
};