71 lines
2.1 KiB
Nix
71 lines
2.1 KiB
Nix
{
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config
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, pkgs
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, lib
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, ...
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}:
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let
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inherit (lib) mkOption types concatStringsSep;
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cfg = config.boot.tftp;
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in {
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imports = [ ./ramdisk.nix ];
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options.boot.tftp.freeSpaceBytes = mkOption {
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type = types.int;
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default = 0;
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};
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options.system.outputs = {
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tftpboot = mkOption {
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type = types.package;
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description = ''
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Directory containing files needed for TFTP booting
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'';
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};
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boot-scr = mkOption {
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type = types.package;
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description = ''
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U-Boot commands to load and boot a kernel and rootfs over TFTP.
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Copy-paste into the device boot monitor
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'';
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};
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};
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config = {
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boot.ramdisk.enable = true;
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system.outputs = rec {
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tftpboot =
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let o = config.system.outputs; in
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pkgs.runCommand "tftpboot" {} ''
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mkdir $out
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cd $out
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ln -s ${o.rootfs} rootfs
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ln -s ${o.kernel} vmlinux
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ln -s ${o.manifest} manifest
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ln -s ${o.kernel.headers} build
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ln -s ${o.uimage} uimage
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ln -s ${o.boot-scr} boot.scr
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'';
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boot-scr =
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let
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inherit (pkgs.lib.trivial) toHexString;
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o = config.system.outputs;
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in
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pkgs.buildPackages.runCommand "boot-scr" {} ''
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uimageSize=$(($(stat -L -c %s ${o.uimage}) + 0x1000 &(~0xfff)))
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rootfsStart=0x$(printf %x $((${cfg.loadAddress} + 0x100000 + $uimageSize)))
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rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
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rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
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cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${config.hardware.flash.eraseBlockSize} memmap=''${rootfsBytes}\$''${rootfsStart} root=/dev/mtdblock0";
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cat > $out << EOF
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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setenv bootargs 'liminix $cmd'
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tftp 0x$(printf %x ${cfg.loadAddress}) result/uimage ; tftp 0x$(printf %x $rootfsStart) result/rootfs
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bootm 0x$(printf %x ${cfg.loadAddress})
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EOF
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'';
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};
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};
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}
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