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add support for OpenWrt device trees

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This commit is contained in:
Daniel Barlow 2022-10-05 21:52:30 +01:00
parent 2f3072d7d5
commit 9cbffdab50
4 changed files with 49 additions and 21 deletions
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8
default.nix
View file

@ -16,13 +16,19 @@ let
kernel = callPackage ./kernel {
inherit (config.kernel) config checkedConfig;
};
outputs = rec {
inherit squashfs kernel;
dtb = kernel.dtb {
dts = "qca9531_glinet_gl-ar750.dts";
};
uimage = kernel.uimage {
commandLine = "earlyprintk=serial,ttyS0 console=ttyS0,115200 panic=10 oops=panic init=/bin/init loglevel=8 rootfstype=squashfs";
inherit (device.boot) loadAddress entryPoint;
inherit (kernel) vmlinux;
inherit dtb;
};
combined-image = nixpkgs.pkgs.runCommand "firmware.bin" {
nativeBuildInputs = [ nixpkgs.buildPackages.ubootTools ];
} ''

5
devices/gl-ar750.nix
View file

@ -28,9 +28,11 @@
};
kernel = {
checkedConfig = {
"MIPS_RAW_APPENDED_DTB" = "y";
"MIPS_ELF_APPENDED_DTB" = "y";
};
config = {
MIPS_ELF_APPENDED_DTB = "y";
# this is all copied from nixwrt ath79 config. Clearly not all
# of it is device config, some of it is wifi config or
# installation method config or ...
@ -46,7 +48,6 @@
"IMAGE_CMDLINE_HACK" = "n";
"IP_PNP" = "y";
"JFFS2_FS" = "n";
"MIPS_RAW_APPENDED_DTB" = "y";
"MODULE_SIG" = "y";
"MTD_CMDLINE_PARTS" = "y";
"MTD_SPLIT_FIRMWARE" = "y";

15
kernel/default.nix
View file

@ -34,9 +34,24 @@ let
cp -a . $out
'';
};
openwrtSource = fetchFromGitHub {
repo = "openwrt";
owner = "openwrt";
rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
};
in rec {
vmlinux = callPackage ./vmlinux.nix {
inherit tree config checkedConfig;
};
uimage = callPackage ./uimage.nix { };
dtb = callPackage ./dtb.nix {
openwrt = openwrtSource;
kernel = tree;
};
}

42
kernel/uimage.nix
View file

@ -2,41 +2,47 @@
lzma
, stdenv
, ubootTools
, dtc
} :
let
objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
in {
vmlinux
# , commandLine
# , fdt ? null
, commandLine
, entryPoint
# , extraName ? "" # e.g. socFamily
, extraName ? "" # e.g. socFamily
, loadAddress
, dtb ? null
} :
# patchDtbCommand = if (fdt != null) then ''
# ( cat vmlinux.stripped ${fdt} > vmlinux.tmp ) && mv vmlinux.tmp vmlinux.stripped
# '' else ''
# echo patch-cmdline vmlinux.stripped '${commandLine}'
# patch-cmdline vmlinux.stripped '${commandLine}'
# echo
# '';
stdenv.mkDerivation {
name = "kernel.image";
phases = [ "buildPhase" "installPhase" ];
phases = [
"preparePhase"
(if dtb != null then "dtbPhase" else ":")
"buildPhase"
"installPhase" ];
nativeBuildInputs = [
# patchImage
lzma
dtc
stdenv.cc
ubootTools
];
preparePhase = ''
cp ${vmlinux} vmlinux.elf; chmod +w vmlinux.elf
'';
dtbPhase = ''
dtc -I dtb -O dts -o tmp.dts ${dtb}
echo '/{ chosen { bootargs = ${builtins.toJSON commandLine}; }; };' >> tmp.dts
dtc -I dts -O dtb -o tmp.dtb tmp.dts
${objcopy} --update-section .appended_dtb=tmp.dtb vmlinux.elf || ${objcopy} --add-section .appended_dtb=${dtb} vmlinux.elf
'';
buildPhase = ''
${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S ${vmlinux} vmlinux.stripped
# {patchDtbCommand}
rm -f vmlinux.stripped.lzma
lzma -k -z vmlinux.stripped
mkimage -A mips -O linux -T kernel -C lzma -a ${loadAddress} -e ${entryPoint} -n 'MIPS Liminix Linux ' -d vmlinux.stripped.lzma kernel.image
${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S vmlinux.elf vmlinux.bin
rm -f vmlinux.bin.lzma ; lzma -k -z vmlinux.bin
mkimage -A mips -O linux -T kernel -C lzma -a ${loadAddress} -e ${entryPoint} -n 'MIPS Liminix Linux ${extraName}' -d vmlinux.bin.lzma kernel.uimage
'';
installPhase = ''
cp kernel.image $out
cp kernel.uimage $out
'';
}