79 lines
2.5 KiB
Nix
79 lines
2.5 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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options = {
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boot = {
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tftp = {
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loadAddress = mkOption { type = types.str; };
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# These names match the uboot environment variables. I reserve
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# the right to change them if I think of better ones.
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ipaddr = mkOption { type = types.str; };
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serverip = mkOption { type = types.str; };
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enable = mkOption { type = types.boolean; };
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};
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};
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};
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config = {
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kernel = {
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config = {
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MTD = "y";
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MTD_PHRAM = "y";
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MTD_CMDLINE_PARTS = "y";
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MIPS_CMDLINE_FROM_BOOTLOADER = "y";
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# one or more of the following is required to get from
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# VFS: Cannot open root device "1f00" or unknown-block(31,0): error -6
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# to
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# VFS: Mounted root (squashfs filesystem) readonly on device 31:0.
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MTD_OF_PARTS = "y";
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PARTITION_ADVANCED = "y";
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MSDOS_PARTITION = "y";
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EFI_PARTITION = "y";
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MTD_BLKDEVS = "y";
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MTD_BLOCK = "y";
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# CONFIG_MTD_MTDRAM=m c'est quoi?
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};
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};
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outputs.tftproot =
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let o = config.outputs; in
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pkgs.runCommand "tftproot" {} ''
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mkdir $out
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cd $out
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ln -s ${o.squashfs} squashfs
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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 ${o.boot-scr} boot.scr
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'';
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outputs.boot-scr =
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let
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inherit (pkgs.lib.trivial) toHexString;
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in
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pkgs.buildPackages.runCommand "" {} ''
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uimageSize=$(($(stat -L -c %s ${config.outputs.uimage}) + 0x1000 &(~0xfff)))
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squashfsStart=0x$(printf %x $((${cfg.loadAddress} + $uimageSize)))
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squashfsBytes=$(($(stat -L -c %s ${config.outputs.squashfs}) + 0x100000 &(~0xfffff)))
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squashfsMb=$(($squashfsBytes >> 20))
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cmd="mtdparts=phram0:''${squashfsMb}M(nix) phram.phram=phram0,''${squashfsStart},''${squashfsMb}Mi memmap=''${squashfsMb}M\$''${squashfsStart} root=1f00";
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cat > $out << EOF
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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setenv bootargs '${concatStringsSep " " config.boot.commandLine} $cmd'
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tftp 0x$(printf %x ${cfg.loadAddress}) result/uimage ; tftp 0x$(printf %x $squashfsStart) result/squashfs
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bootm 0x$(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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