Let me add my $.02. I have a request to be able to boot a USB drive. So, reading a GPIO pin and making a decision in a script is a desirable thing. Certainly a 'MD 0x12345678' can read a pin but then making a decision in an environment string chain would help. Can we do this? On Mar 28, 2011 1:57 AM, "Rogan Dawes" rogan@dawes.za.net wrote:
Hi folks,
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!
Thanks,
Rogan _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot