[U-Boot] Support for reading GPIO's in boot scripts?

[Rogan Dawes]

On 2011/03/28 11:08 AM, Mike Frysinger wrote:
> On Mon, Mar 28, 2011 at 4:57 AM, Rogan Dawes wrote:
>> I'm wondering if there is any support in u-boot for reading the state of
>> a GPIO input (i.e. button) to control the sequence of boot events?
>>
>> i.e. my board has a reset button, can I read its state to determine
>> whether to try to TFTP-boot a new kernel, or to boot the existing one in
>> flash?
>>
>> I did try to grep the sources for any hints, but did not find anything.
>> I may have been looking in the wrong place, of course!
> 
> i plan on generalizing arch/blackfin/cpu/cmd_gpio.c for all arches in
> this next cycle (it is mostly done).  but that would require your arch
> to support the generic gpio layer.
> -mike

Cool, thanks for the answer, Mike!

I'll wait to see what you do, and whatever needs to be done for my
arch/board.

Rogan