118 lines
3.8 KiB
Nix
118 lines
3.8 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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inherit (config.boot) tftp;
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in {
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options.system.outputs = {
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firmware = mkOption {
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type = types.package;
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internal = true; # component of mtdimage
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description = ''
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Binary image (combining kernel, FDT, rootfs, initramfs
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if needed, etc) for the target device.
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'';
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};
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flash-scr = mkOption {
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type = types.package;
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internal = true; # component of mtdimage
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description = ''
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Copy-pastable U-Boot commands to TFTP download the
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image and write it to flash
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'';
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};
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mtdimage = mkOption {
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type = types.package;
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description = ''
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mtdimage
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**********
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This creates an image called :file:`firmware.bin` suitable for
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squashfs or jffs2 systems. It can be flashed from U-Boot (if
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you have a serial console connection), or on some devices from
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the vendor firmware, or from a Liminix kexecboot system.
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If you are flashing from U-Boot, the file
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:file:`flash.scr` is a sequence of commands
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which you can paste at the U-Boot prompt to
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to transfer the firmware file from a TFTP server and
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write it to flash. **Please read the script before
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running it: flash operations carry the potential to
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brick your device**
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.. NOTE::
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TTL serial connections typically have no form of flow
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control and so don't always like having massive chunks of
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text pasted into them - and U-Boot may drop characters
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while it's busy. So don't necessarily expect to copy-paste
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the whole of :file:`flash.scr` into a terminal emulator and
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have it work just like that. You may need to paste each
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line one at a time, or even retype it.
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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_SPLIT_UIMAGE_FW = "y";
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} // lib.optionalAttrs (pkgs.stdenv.isMips) {
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# https://stackoverflow.com/questions/26466470/can-the-logical-erase-block-size-of-an-mtd-device-be-increased
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MTD_SPI_NOR_USE_4K_SECTORS = "n";
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};
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};
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programs.busybox.applets = [
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"flashcp"
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];
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system.outputs = {
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firmware =
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let
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o = config.system.outputs;
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bs = toString config.hardware.flash.eraseBlockSize;
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in pkgs.runCommand "firmware" {} ''
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dd if=${o.uimage} of=$out bs=${bs} conv=sync
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dd if=${o.rootfs} of=$out bs=${bs} conv=sync,nocreat,notrunc oflag=append
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'';
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mtdimage =
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let o = config.system.outputs; in
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# could use trivial-builders.linkFarmFromDrvs here?
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pkgs.runCommand "mtdimage" {} ''
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mkdir $out
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cd $out
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ln -s ${o.firmware} firmware.bin
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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.dtb} dtb
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ln -s ${o.flash-scr} flash.scr
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'';
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flash-scr =
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let
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inherit (pkgs.lib.trivial) toHexString;
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inherit (config.hardware) flash;
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in
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pkgs.buildPackages.runCommand "" {} ''
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imageSize=$(stat -L -c %s ${config.system.outputs.firmware})
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cat > $out << EOF
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setenv serverip ${tftp.serverip}
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setenv ipaddr ${tftp.ipaddr}
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tftp 0x${toHexString tftp.loadAddress} result/firmware.bin
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erase 0x${toHexString flash.address} +0x${toHexString flash.size}
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cp.b 0x${toHexString tftp.loadAddress} 0x${toHexString flash.address} \''${filesize}
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echo command line was ${builtins.toJSON (concatStringsSep " " config.boot.commandLine)}
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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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