[U-Boot-Users] using a flat device tree to drive u-boot config

Robert Schwebel
2008-07-29T15:51:08Z

On Mon, Jul 28, 2008 at 10:07:49AM -0500, Kumar Gala wrote:
> One topic that come up during OLS in discussions and u-boot BOF was
> the idea of driving u-boot configuration from a device tree instead of
> from "config.h". I was wondering if anyone has actually looked at
> doing this.
>
> One question I have is how does (or should) u-boot identify where to
> find the device tree. I think the idea would be that this "area"
> could be easily reflashed with a new blob to get a new configuration.

The idea is interesting; we have already thought about generating device
trees in u-boot-v2 from the driver model.

As u-boot-v2 has a module concept (think of it as in linux -> insmod
plus EXPORT_SYMBOL), it would even be possible to change the driver
model to device tree transformation by uploading a new module; this is
necessary, as upstream maintainers tend to break oftree semantics with
almost every kernel release - seems to be part of the design :-)

However, no time to investigate this further atm.

rsc
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Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
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