liminix

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tftpboot.nix (2177B)

      1 {
      2   config
      3 , pkgs
      4 , lib
      5 , ...
      6 }:
      7 let
      8   inherit (lib) mkOption types concatStringsSep;
      9   cfg = config.boot.tftp;
     10 in {
     11   imports = [ ./ramdisk.nix ];
     12   options.boot.tftp.freeSpaceBytes = mkOption {
     13     type = types.int;
     14     default = 0;
     15   };
     16   options.system.outputs = {
     17     tftpboot = mkOption {
     18       type = types.package;
     19       description = ''
     20         Directory containing files needed for TFTP booting
     21       '';
     22     };
     23     boot-scr = mkOption {
     24       type = types.package;
     25       description = ''
     26         U-Boot commands to load and boot a kernel and rootfs over TFTP.
     27         Copy-paste into the device boot monitor
     28       '';
     29     };
     30   };
     31   config = {
     32     boot.ramdisk.enable = true;
     33 
     34     system.outputs = rec {
     35       tftpboot =
     36         let o = config.system.outputs; in
     37         pkgs.runCommand "tftpboot" {} ''
     38           mkdir $out
     39           cd $out
     40           ln -s ${o.rootfs} rootfs
     41           ln -s ${o.kernel} vmlinux
     42           ln -s ${o.manifest} manifest
     43           ln -s ${o.kernel.headers} build
     44           ln -s ${o.uimage} uimage
     45           ln -s ${o.boot-scr} boot.scr
     46        '';
     47 
     48       boot-scr =
     49         let
     50           inherit (pkgs.lib.trivial) toHexString;
     51           o = config.system.outputs;
     52         in
     53           pkgs.buildPackages.runCommand "boot-scr" {} ''
     54             uimageSize=$(($(stat -L -c %s ${o.uimage}) + 0x1000 &(~0xfff)))
     55             rootfsStart=0x$(printf %x $((${cfg.loadAddress} + 0x100000 + $uimageSize)))
     56             rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
     57             rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
     58             cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${config.hardware.flash.eraseBlockSize} memmap=''${rootfsBytes}\$''${rootfsStart} root=/dev/mtdblock0";
     59 
     60             cat > $out << EOF
     61             setenv serverip ${cfg.serverip}
     62             setenv ipaddr ${cfg.ipaddr}
     63             setenv bootargs 'liminix $cmd'
     64             tftp 0x$(printf %x ${cfg.loadAddress}) result/uimage ; tftp 0x$(printf %x $rootfsStart) result/rootfs
     65             bootm 0x$(printf %x ${cfg.loadAddress})
     66             EOF
     67           '';
     68     };
     69   };
     70 }