[U-Boot-Users] fdt chosen node handling

Stefan Roese sr at denx.de
Wed Dec 19 14:02:15 CET 2007

Hi Jerry,

On Wednesday 19 December 2007, Jerry Van Baren wrote:
> Disclaimer: I am not a OF expert, I have not read the OF documentation
> cover to cover and do not understand many implications of what I've
> read, much less what I have _not_ read.
> 1) I believe the /chosen node should be auto-created.

Ufff. :)

> 2) As you point out, if the /chosen node already exists the current code
> bails out and doesn't change anything.  This was done as a very badly
> misguided attempt to make libfdt things work like bd_t things.  The
> granularity should be on the individual properties, not on /chosen.  I
> consider this a bug and have it on my "todo" list to fix (actually, I
> had created a patch, but I need to rebase and publish it).
> <http://www.denx.de/wiki/view/UBoot/UBootFdtInfo#Outstanding_Patches>
> "Unpublished patch of JerryVanBaren, implementing a suggestion by Scott
> Wood to make the /chosen handling finer grained: if the /chosen node
> exists, currently u-boot-fdt bails out. A better methodology is to not
> overwrite pre-existing properties on a per-property basis, so if /chosen
> exists but a necessary /chosen/property doesn't, it gets created. Good
> idea, but not published and poorly tested at the moment."

OK, thanks for these infos.

Best regards,

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