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Code Pull requests 2 Activity Actions

make config.hardware.dts.src nullable

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This is for QEMU where we won't have to provide a dtb because the
device tree is built by the platform according the (emulated) hardware
present.

Maybe in future there will be other hardware devices where we
don't need to provide a dtb.
This commit is contained in:
Daniel Barlow 2023-12-09 15:51:30 +00:00
parent 03b17fa3ed
commit 4229b42d82
2 changed files with 15 additions and 8 deletions
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10
modules/hardware.nix
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@ -16,8 +16,14 @@ in {
hardware = {
dts = {
src = mkOption {
type = types.path;
description = "Path to the device tree source (usually from OpenWrt)";
type = types.nullOr types.path;
description = ''
If the device requires an external device tree to be loaded
alongside the kernel, this is the path to the device tree source
(we usually get these from OpenWrt). This value may be null if the
platform creates the device tree - currently this is the case
only for QEMU.
'';
};
includes = mkOption {
default = [];

13
modules/outputs/extlinux.nix
View file

@ -9,6 +9,7 @@ let
cfg = config.boot.loader.extlinux;
o = config.system.outputs;
cmdline = concatStringsSep " " config.boot.commandLine;
wantsDtb = config.hardware.dts ? src && config.hardware.dts.src != null;
in {
options.system.outputs.extlinux = mkOption {
type = types.package;
@ -20,18 +21,18 @@ in {
system.outputs.extlinux = pkgs.runCommand "extlinux" {} ''
mkdir $out
cd $out
# cp {o.dtb} dtb
${if wantsDtb then "cp ${o.dtb} dtb" else "true"}
cp ${o.initramfs} initramfs
gzip -9f < ${o.kernel} > kernel.gz
cp ${o.zimage} kernel
mkdir extlinux
cat > extlinux/extlinux.conf << _EOF
menu title Liminix
timeout 100
label Liminix
kernel /boot/kernel.gz
initrd /boot/initramfs
append ${cmdline}
# fdt /boot/dtb
kernel /boot/kernel
# initrd /boot/initramfs
append ${cmdline} root=/dev/vda1
${if wantsDtb then "fdt /boot/dtb" else ""}
_EOF
'';
};