[Nix-dev] Customizing kernel options and thoroughly failing.

[Shea Levy]

Hi Matt,

I'm not sure off the top of my head how to get this working with the
nixpkgs extraConfig mechanism, but as an alternative if you generate
your own .config file (e.g. by copying the one from a running NixOS
system and using menuconfig in a kernel checkout to add the options you
want) then you can use the `buildLinux` function in nixpkgs directly
(see pkgs/os-specific/linux/kernel/manual-config.nix for arguments).

Thanks,
Shea

Matthew Robbetts <wingfeathera at gmail.com> writes:

> Having only just realized that my ath10k driver is built by default without DFS support, I need to modify my kernel options. Googling turned up:
> https://nixos.org/wiki/How_to_tweak_Linux_kernel_config_options <https://nixos.org/wiki/How_to_tweak_Linux_kernel_config_options>
>
> This lead me to include:
>
> nixpkgs.config.packageOverrides = pkgs: rec {
> 	...
> 	stdenv = pkgs.stdenv // {
> 		platform = pkgs.stdenv.platform // {
> 			kernelExtraConfig =
>                         ''
>                                     CONFIG_EXPERT y
>                                     CONFIG_CFG80211_CERTIFICATION_ONUS y
>                                     CONFIG_ATH10K_DFS_CERTIFIED y
>                         '';
> 			};
> 		};
> 		...
>
>
> in my configuration.nix, as these appear to be the three options I need to add. So far so good.
>
>
> However, when I try to realize this new configuration, the kernel build fails with:
>
> unused option: CONFIG_ATH10K_DFS_CERTIFIED
>
> If I comment that option, just for kicks, I then fail with:
>
> unused option: CONFIG_CFG80211_CERTIFICATION_ONUS
>
> What am I missing here? Something obvious, I expect! I’ve turned up the following pages with similar seeming failures, but they’re just output dumps with no context:
> http://pastebin.com/jAMxyzJA
> http://pastebin.com/4sxGZdaq
> https://gist.github.com/thorhop/1dc181a40f5320b22ff0
>
>
> Thanks,
> Matt
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