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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
inherit (lib) mkIf mkOption types;
cfg = config.boot.tftp;
instructions = pkgs.writeText "env.scr" ''
instructions = pkgs.writeText "flash.scr" ''
setenv serverip ${cfg.serverip}
setenv ipaddr ${cfg.ipaddr}
setenv loadaddr ${lib.toHexString cfg.loadAddress}
tftpboot $loadaddr result/rootfs
ubi write $loadaddr liminix $filesize
'';
in {
options.system.outputs = {
@ -63,18 +65,20 @@ Now we can make our new root volume
uboot> ubi create liminix -
3) transfer the root filesystem from the build system and write it
to the new volume. Paste the environment variable settings from
:file:`result/env.scr` into U-Boot, then run
3) transfer the root filesystem from the build system and write it to
the new volume. Paste the contents of :file:`result/flash.scr` one line at a time
into U-Boot:
.. code-block:: console
uboot> tftpboot ''${loadaddr} result/rootfs
uboot> ubi write ''${loadaddr} liminix $filesize
uboot> setenv serverip 10.0.0.1
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
can even mount it and poke around using ``ubifsmount ubi0:liminix;
ubifsls /``
can even mount it and poke around using :command:`ubifsmount ubi0:liminix; ubifsls /`
4) optional: before you configure the device to boot into Liminix
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.
5) Instructions for configuring autoboot are likely to be very
device-dependent. On the Linksys E8450/Belkin RT3200, the environment
variable `boot_production` governs what happens on a normal boot, so
you could do
.. code-block:: console
uboot> setenv orig_boot_production $boot_production
uboot> setenv boot_production 'led $bootled_pwr on ; ubifsmount ubi0:liminix && ubifsload ''${loadaddr} boot/fit && bootm ''${loadaddr}'
uboot> saveenv
uboot> reset
On other devices, some detective work may be needed. Try running
`printenv` and look for likely commands, try looking at the existing
boot process, maybe even try looking for documentation for that device.
device-dependent and you should consult the Liminix documentation for
your device. (If you're bringing up a new device, some detective work
may be needed. Try running `printenv` and trace through the flow of
execution from (probably) :command:`$bootcmd` and look for a suitable
variable to change)
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
cd $out
ln -s ${o.rootfs} rootfs
ln -s ${instructions} env.scr
ln -s ${instructions} flash.scr
'';
}