Look at this Makefile — then look at this NixOS package derivation. Appears simple but I couldn’t for the life of me divine how to quickly compile a custom/patched kernel module on NixOS. Abstractions… are very magical. The guide is cool and all, but it’s a better time investment to guesstimate the relationship between the higher/lower layer. This friendly example looks more like this in reality though ;-)
Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.
Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.
A NixOS configuration for a working sound driver on an A1418 Cirrus Logic CS8409/CS42L83.
{ stdenv, lib, fetchgit, linuxKernel, kernel ? linuxKernel.kernels.linux_5_15
, version ? "d0d785dc1859b09299bde6d0f1d6786a0d610e7f" }:
stdenv.mkDerivation {
inherit version;
name = "sna-hda-codec-cs8409-${version}-module-${kernel.modDirVersion}";
# Upstream: https://github.com/davidjo/snd_hda_macbookpro
src = fetchgit {
url = "https://github.com/egorenar/snd-hda-codec-cs8409.git";
rev = version;
sha256 = "sha256-0UeoERcYpM+ojeZ7dDIE3ruTIoHkkC+s7FcoEVUTR0w=";
};
hardeningDisable = [ "pic" ];
nativeBuildInputs = kernel.moduleBuildDependencies;
NIX_CFLAGS_COMPILE = [ "-g" "-Wall" "-Wno-unused-variable" "-Wno-unused-function" ];
makeFlags = kernel.makeFlags ++ [
"INSTALL_MOD_PATH=$(out)"
"KERNELRELEASE=${kernel.modDirVersion}"
"KERNEL_DIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
];
postPatch = ''
printf '
snd-hda-codec-cs8409-objs := patch_cs8409.o patch_cs8409-tables.o
obj-$(CONFIG_SND_HDA_CODEC_CS8409) += snd-hda-codec-cs8409.o
KBUILD_EXTRA_CFLAGS = "-DAPPLE_PINSENSE_FIXUP -DAPPLE_CODECS -DCONFIG_SND_HDA_RECONFIG=1"
KERNELRELEASE ?= $(shell uname -r)
KERNEL_DIR ?= /lib/modules/$(KERNELRELEASE)/build
PWD := $(shell pwd)
default:
make -C $(KERNEL_DIR) M=$(PWD) CFLAGS_MODULE=$(KBUILD_EXTRA_CFLAGS)
install:
make -C $(KERNEL_DIR) M=$(PWD) modules_install
' \
> Makefile
sed --in-place 's|<sound/cs42l42.h>|"${linuxKernel.kernels.linux_6_0.dev}/lib/modules/${linuxKernel.kernels.linux_6_0.modDirVersion}/source/include/sound/cs42l42.h"|' patch_cs8409.h
sed --in-place 's|hda_local.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_local.h|' patch_cs8409.h
sed --in-place 's|hda_jack.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_jack.h|' patch_cs8409.h
sed --in-place 's|hda_generic.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_generic.h|' patch_cs8409.h
sed --in-place 's|hda_auto_parser.h|${kernel.dev}/lib/modules/${kernel.modDirVersion}/source/sound/pci/hda/hda_auto_parser.h|' patch_cs8409.h
'';
meta = { platforms = lib.platforms.linux; };
}Then build it as a extra/custom kernel module. The results of stumbling upon yet another troublesome device…
{ pkgs, ... }:
{
boot = {
extraModulePackages = [
(pkgs.callPackage ../packages/snd-hda-cs8409/default.nix {
kernel = pkgs.linux_5_15;
})
];
};
}Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.
My default
nix
configuration on NixOS.
This configuration is more for building/debugging stuff and caching with
nix-serve.
Usually my package version is locked since different
versions of
nix can have some effects.
{ config, ... }:
{
nix = {
package = (import ../versions.nix).nix_2_17 { inherit config; };
settings = {
log-lines = 25; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-log-lines
fallback = true; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-fallback
tarball-ttl = 0; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-tarball-ttl
show-trace = true; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-show-trace
connect-timeout = 5; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-connect-timeout
auto-optimise-store = true; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-auto-optimise-store
narinfo-cache-negative-ttl = 0; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-narinfo-cache-negative-ttl
narinfo-cache-positive-ttl = 0; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-narinfo-cache-positive-ttl
builders-use-substitutes = true; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-builders-use-substitutes
min-free = 268435456; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-min-free (256 MB in Bytes)
max-free = 1073741824; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-max-free (1 GB in Bytes)
allowed-users = [ "root" "@wheel" ]; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-allowed-users
trusted-users = [ "root" "@wheel" ]; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-trusted-users
experimental-features = "nix-command flakes"; # https://nixos.org/manual/nix/unstable/command-ref/conf-file.html#conf-experimental-features
};
};
}Another wandering soul whispering into the void. If you are looking for my blog you are in the wrong place. The profile and header pictures are brought to you by cdd20.
I thought about posting notes on Syncthing but then I’d have to tangentially talk about NixOS. NixOS is my main Linux distribution but Nix/NixOS/Flakes are too hard to write about and I fear they’ve ventured too far into the realm of over–engineering.
What do I mean by over–engineering? An over–engineered tool is one where even the simplest use cases are non–obvious (to most people) and this can happen when it tries to do too many things with “specificity”. The overall concept is elegant though (explainable in lay terms) and can be applied in other contexts.