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automate ubimage instructions a little

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This commit is contained in:
Daniel Barlow 2025-01-01 12:38:08 +00:00
parent 788169586f
commit 497307588f
1 changed files with 18 additions and 23 deletions
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41
modules/outputs/ubimage.nix
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@ -7,10 +7,12 @@
let let
inherit (lib) mkIf mkOption types; inherit (lib) mkIf mkOption types;
cfg = config.boot.tftp; cfg = config.boot.tftp;
instructions = pkgs.writeText "env.scr" '' instructions = pkgs.writeText "flash.scr" ''
setenv serverip ${cfg.serverip} setenv serverip ${cfg.serverip}
setenv ipaddr ${cfg.ipaddr} setenv ipaddr ${cfg.ipaddr}
setenv loadaddr ${lib.toHexString cfg.loadAddress} setenv loadaddr ${lib.toHexString cfg.loadAddress}
tftpboot $loadaddr result/rootfs
ubi write $loadaddr liminix $filesize
''; '';
in { in {
options.system.outputs = { options.system.outputs = {
@ -63,18 +65,20 @@ Now we can make our new root volume
uboot> ubi create liminix - uboot> ubi create liminix -
3) transfer the root filesystem from the build system and write it 3) transfer the root filesystem from the build system and write it to
to the new volume. Paste the environment variable settings from the new volume. Paste the contents of :file:`result/flash.scr` one line at a time
:file:`result/env.scr` into U-Boot, then run into U-Boot:
.. code-block:: console .. code-block:: console
uboot> tftpboot ''${loadaddr} result/rootfs uboot> setenv serverip 10.0.0.1
uboot> ubi write ''${loadaddr} liminix $filesize uboot> setenv ipaddr 10.0.0.8
uboot> setenv loadaddr 4007FF28
uboot> tftpboot $loadaddr result/rootfs
uboot> ubi write $loadaddr liminix $filesize
Now we have the root filesystem installed on the device. You Now we have the root filesystem installed on the device. You
can even mount it and poke around using ``ubifsmount ubi0:liminix; can even mount it and poke around using :command:`ubifsmount ubi0:liminix; ubifsls /`
ubifsls /``
4) optional: before you configure the device to boot into Liminix 4) optional: before you configure the device to boot into Liminix
automatically, you can try booting it by hand to see if it works: automatically, you can try booting it by hand to see if it works:
@ -89,20 +93,11 @@ Once you've done this and you're happy with it, reset the device to
return to U-Boot. return to U-Boot.
5) Instructions for configuring autoboot are likely to be very 5) Instructions for configuring autoboot are likely to be very
device-dependent. On the Linksys E8450/Belkin RT3200, the environment device-dependent and you should consult the Liminix documentation for
variable `boot_production` governs what happens on a normal boot, so your device. (If you're bringing up a new device, some detective work
you could do may be needed. Try running `printenv` and trace through the flow of
execution from (probably) :command:`$bootcmd` and look for a suitable
.. code-block:: console variable to change)
uboot> setenv orig_boot_production $boot_production
uboot> setenv boot_production 'led $bootled_pwr on ; ubifsmount ubi0:liminix && ubifsload ''${loadaddr} boot/fit && bootm ''${loadaddr}'
uboot> saveenv
uboot> reset
On other devices, some detective work may be needed. Try running
`printenv` and look for likely commands, try looking at the existing
boot process, maybe even try looking for documentation for that device.
6) Now you can reboot the device into Liminix 6) Now you can reboot the device into Liminix
@ -120,6 +115,6 @@ boot process, maybe even try looking for documentation for that device.
mkdir $out mkdir $out
cd $out cd $out
ln -s ${o.rootfs} rootfs ln -s ${o.rootfs} rootfs
ln -s ${instructions} env.scr ln -s ${instructions} flash.scr
''; '';
} }