127 lines
3.5 KiB
Nix
127 lines
3.5 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) mkIf mkEnableOption mkOption types concatStringsSep;
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cfg = config.boot.tftp;
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instructions = pkgs.writeText "env.scr" ''
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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setenv loadaddr ${lib.toHexString cfg.loadAddress}
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'';
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in {
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options.system.outputs = {
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ubimage = mkOption {
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type = types.package;
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description = ''
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ubimage
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*******
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This output provides a UBIFS filesystem image and a small U-Boot script
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to make the manual installation process very slightly simpler. You will
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need a serial connection and a network connection to a TFTP server
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containing the filesystem image it creates.
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.. warning:: These steps were tested on a Belkin RT3200 (also known as
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Linksys E8450). Other devices may be set up differently,
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so use them as inspiration and don't just paste them
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blindly.
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1) determine which MTD device is being used for UBI, and the partition name:
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.. code-block:: console
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uboot> ubi part
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Device 0: ubi0, MTD partition ubi
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In this case the important value is ``ubi0``
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2) list the available volumes and create a new one on which to install Liminix
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.. code-block:: console
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uboot> ubi info l
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[ copious output scrolls past ]
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Expect there to be existing volumes and for some or all of them to be
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important. Unless you know what you're doing, don't remove anything
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whose name suggests it's related to uboot, or any kind of backup or
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recovery partition. To see how much space is free:
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.. code-block:: console
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uboot> ubi info
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[ ... ]
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UBI: available PEBs: 823
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Now we can make our new root volume
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.. code-block:: console
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uboot> ubi create liminix -
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3) transfer the root filesystem from the build system and write it
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to the new volume. Paste the environment variable settings from
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:file:`result/env.scr` into U-Boot, then run
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.. code-block:: console
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uboot> tftpboot ''${loadaddr} result/rootfs
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uboot> ubi write ''${loadaddr} liminix $filesize
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Now we have the root filesystem installed on the device. You
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can even mount it and poke around using ``ubifsmount ubi0:liminix;
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ubifsls /``
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4) optional: before you configure the device to boot into Liminix
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automatically, you can try booting it by hand to see if it works:
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.. code-block:: console
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uboot> ubifsmount ubi0:liminix
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uboot> ubifsload ''${loadaddr} boot/uimage
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uboot> bootm ''${loadaddr}
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Once you've done this and you're happy with it, reset the device to
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U-Boot. You don't need to recreate the volume but you do need to
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repeat step 3.
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5) Instructions for configuring autoboot are likely to be very
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device-dependent. On the Linksys E8450/Belkin RT3200, the environment
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variable `boot_production` governs what happens on a normal boot, so
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you could do
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.. code-block:: console
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uboot> setenv boot_production 'led $bootled_pwr on ; ubifsmount ubi0:liminix; ubifsload ''${loadaddr} boot/uimage; bootm ''${loadaddr}'
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On other devices, some detective work may be needed. Try running
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`printenv` and look for likely commands, try looking at the existing
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boot process, maybe even try looking for documentation for that device.
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6) Now you can reboot the device into Liminix
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.. code-block:: console
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uboot> reset
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'';
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};
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};
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config = mkIf (config.rootfsType == "ubifs") {
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system.outputs = {
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ubimage =
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let o = config.system.outputs; in
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pkgs.runCommand "ubimage" {} ''
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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 ${instructions} env.scr
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'';
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};
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};
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}
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