liminix-fork/modules/flashimage.nix

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{
config
, pkgs
, lib
, ...
}:
let
inherit (lib) mkOption types concatStringsSep;
inherit (config.boot) tftp;
in {
options.system.outputs = {
firmware = mkOption {
type = types.package;
internal = true; # component of flashimage
description = ''
Binary image (combining kernel, FDT, rootfs, initramfs
if needed, etc) for the target device.
'';
};
flash-scr = mkOption {
type = types.package;
internal = true; # component of flashimage
description = ''
Copy-pastable U-Boot commands to TFTP download the
image and write it to flash
'';
};
flashimage = mkOption {
type = types.package;
description = ''
Flashable image for the target device, and the script to
install it
'';
};
};
config = {
kernel = {
config = {
MTD_SPLIT_UIMAGE_FW = "y";
};
};
programs.busybox.applets = [
"flashcp"
];
system.outputs = {
firmware =
let o = config.system.outputs; in
pkgs.runCommand "firmware" {} ''
dd if=${o.uimage} of=$out bs=128k conv=sync
dd if=${o.rootfs} of=$out bs=128k conv=sync,nocreat,notrunc oflag=append
'';
flashimage =
let o = config.system.outputs; in
pkgs.runCommand "flashimage" {} ''
mkdir $out
cd $out
ln -s ${o.firmware} firmware.bin
ln -s ${o.rootfs} rootfs
ln -s ${o.kernel} vmlinux
ln -s ${o.manifest} manifest
ln -s ${o.kernel.headers} build
ln -s ${o.uimage} uimage
ln -s ${o.dtb} dtb
ln -s ${o.flash-scr} flash.scr
'';
flash-scr =
let
inherit (pkgs.lib.trivial) toHexString;
inherit (config.hardware) flash;
in
pkgs.buildPackages.runCommand "" {} ''
imageSize=$(stat -L -c %s ${config.system.outputs.firmware})
cat > $out << EOF
setenv serverip ${tftp.serverip}
setenv ipaddr ${tftp.ipaddr}
tftp 0x$(printf %x ${tftp.loadAddress}) result/firmware.bin
erase 0x$(printf %x ${flash.address}) +${flash.size}
cp.b 0x$(printf %x ${tftp.loadAddress}) 0x$(printf %x ${flash.address}) \''${filesize}
echo command line was ${builtins.toJSON (concatStringsSep " " config.boot.commandLine)}
EOF
'';
};
};
}