Re: Modifying device-tree: /chosen

[Pascal Vizeli <pascal.vizeli@syshack.ch>]

Maybe we can also include the:
http://lists.infradead.org/pipermail/barebox/2015-March/022708.html

It would be nice to use feature like this to modify the device tree
before we boot the kernel.

Pascal

2018-05-23 12:59 GMT+02:00 Baeuerle, Florian <Florian.Baeuerle@allegion.com>:
> Hi,
>
> I haven't found a (good) way to modify the kernel device tree before booting
> when using the bootchooser in combination with blspec.  What seems to be done
> quite often is registering fixup functions (of_register_fixup) in board-specific
> code.
>
> I'd prefer not patch board-specific code, because my use case is rather specific
> (passing the device serial number, the bootloader version, and a few other
> things to the kernel). So the question is, if this use case is common enough to
> provide a more generic way.
>
> My proposal is providing a command like this:
>
> of_fixup_chosen [PROPERTY] [VALUE]
>
> I guess it would suffice to only store strings in /chosen.
>
> Example:
> of_fixup_chosen bootloader-version $global.version
> of_fixup_chosen reset-reason $global.system.reset
> of_fixup_chosen serial $serial_number
>
>
> I'm open for other suggestions, as this could also be implementend in a more
> generic (and also more complex) way by allowing to fix up random nodes and
> properties throughout the device tree.
>
>
> Best Regards
> Florian
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