[Nix-dev] Cross Compiling for Raspberry PI

[Sergey Mironov]

Hi! I'm going to try compiling NixOS for Raspberry PI soon. What is
the status of this target? Alexander, were you able to solve your
problem?

Thanks in advance,
Sergey

2012/7/23 Alexander Foremny <alexanderforemny at gmail.com>:
> Hello,
>
> I am currently trying to cross compile some packages for the Raspberry
> PI. In my private Nixpkgs repository I created the file
> raspberrypi.nix. The relevant parts of that file follow.
>
>> import ./default.nix {
>> crossSystem = {
>>   platform = {
>>     kernelBaseConfig = "bcmrpi_defconfig";
>>     kernelHeadersBaseConfig = "bcmrpi_defconfig";
>>   };
>> config.packageOverrides = pkgs: {
>>   linux_3_5 = pkgs.linux_3_5.override {
>>     kernelPatches = [ pkgs.kernelPatches.raspberrypi_defconfig ];
>>   };
>> };
>> }
>
> I created a raspberry_defconfig patch which adds the file
> bcmrpi_defconfig to the Linux kernel's source tree. Now I'd like to
> try building kernel-headers for the Raspberry PI, thus I ran.
>
>> $ nix-build -A linux_3_5.hostDrv raspberrypi.nix --dry-run
>> these derivations will be built:
>>   /nix/store/31vqzwfyqw52y0s1jy57i1fwx9clcjfh-gcc-4.6.3-arm-unknown-linux-stage-static.drv
>> ...
>>   /nix/store/pxlbdi3sxfisi7z0q9pxgbavjhy2k49v-linux-headers-3.5.drv
>
> Actually building it starts with building
> gcc-4.6.3-arm-unknown-linux-stage-static, but fails with the error,
> that the file bcmrpi_defconfig is not present.
>
>> ...
>> ***
>> *** Can't find default configuration "arch/arm/configs/bcmrpi_defconfig"!
>> ***
>> make[1]: *** [bcmrpi_defconfig] Error 1
>> checking for arm-unknown-linux-nm... make: *** [bcmrpi_defconfig] Error 2
>> builder for `/nix/store/pxlbdi3sxfisi7z0q9pxgbavjhy2k49v-linux-headers-3.5.drv' failed with exit code 2
>
> I am guessing that gcc needs the kernel headers and since
> crossSystem.platform.kernelHeadersBaseConfig is set to
> bcmrpi_defconfig, gcc needs this file. Is this correct?
>
> Would it be a solution, to use a different kernelHeadersBaseConfig
> setting? Would it be a solution, to patch gcc's Nix expression?
>
> Regards,
> Alexander Foremny
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