[U-Boot,U-Boot] ARM: rpi_b: detect board revision

[Tom Rini]

On Tue, Nov 18, 2014 at 09:40:21PM -0700, Stephen Warren wrote:

> Detect the board revision early during boot, and print the decoded
> model name.
> 
> Eventually, this information can be used for tasks such as:
> - Allowing/preventing USB device mode; some models have a USB device on-
>   board so only host mode makes sense. Others connect the SoC directly
>   to the USB connector, so device-mode might make sense.
> - The on-board USB hub/Ethernet requires different GPIOs to enable it,
>   although luckily the default appears to be fine so far.
> - The compute module contains an on-board eMMC device, so we could store
>   the environment there. Other models use an SD card and so don't support
>   saving the environment (unless we store it in a file on the FAT boot
>   partition...)
> 
> Set $fdtfile based on this information. At present, the mainline Linux
> kernel doesn't contain a separate DTB for most models, but I hope that
> will change soon.
> 
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Tested-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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