I introduce the new nixpkgs parameter "platform", defaulting to "pc",
which was before defined as an attribute of nixpkgs.
I made the crossSystem nixpkgs attribute set parameter contain its own 'platform'.
This allows cross-building a kernel for a given crossSystem.platform in a non-PC
platform.
The actual native platform can be taken from stdenv.platform, and this way we also
avoid the constant passing of 'platform' to packages for platform-dependant builds
(kernel, initrd, ...).
I will update nixos accordingly to these changes, for non-PC platforms to work.
I think we are gaining on flexibility and clearness. I could cross build succesfully
an ultrasparc kernel and a mipsel kernel on PC. But since this change, I should be able
to do this also in non-PC.
Before this change, there was no possibility of distinguishing the "target platform" or
the "native build platform" when cross building, being the single "platform" attribute
always interpreted as target platform.
The platform is a quite relevant attribute set, as it determines the linuxHeaders used
(in the case, by now the only one supported, of linux targets).
The platform attributes are quite linux centric still. Let's hope for more generality to come.
svn path=/nixpkgs/trunk/; revision=20273
"meta" and "passthru", and these attributes will be appended to the usual
mkDerivation attributes only if the package is cross built.
This allows putting some of the cross-building logic in the mkDerivation
nix parameters, and not only in the final builder script, as it was until now.
svn path=/nixpkgs/trunk/; revision=20272
Updating the cross-build expressions, adding some flexibility.
Updated the linux headers used cross building, as 2.6.28 had bugs on endianness in
sparc64.
There were, as usual some bugs in gcc. Maybe not many make a cross compiler to
ultrasparc.
For the record, I could build an ultrasparc kernel with this base nix:
import /etc/nixos/nixpkgs/default.nix # The root nixpkgs default.nix
{
crossSystem = {
config = "sparc64-unknown-linux";
bigEndian = true;
arch = "sparc64";
float = "soft";
withTLS = true;
cpu = "ultrasparc";
};
config = pkgs: {
packageOverrides = pkgs : {
platform = {
name = "sparc64";
kernelHeadersBaseConfig = "sparc64_defconfig";
kernelBaseConfig = "sparc64_defconfig";
kernelArch = "sparc";
kernelAutoModules = false;
kernelTarget = "zImage";
uboot = null;
};
};
};
}
Although it did not boot directly in qemu-system-sparc64:
[sparc64] Kernel already loaded
Unhandled Exception 0x0000000000000020
PC = 0x0000000000404000 NPC = 0x0000000000404004
svn path=/nixpkgs/trunk/; revision=20269
not set anywhere. This causes other packages to break on 64-bit
platforms unless they happen to define those macros. So don't rely
on them.
svn path=/nixpkgs/trunk/; revision=20194
