I had problems with those pins and found that the resistive "loading" at boot needs to be quite high. I did not get this at first, and I had a bipolar transistor switch connected which was something on the order of 50kohms input resistance. Well, that was too low for reliable boot process! Sometimes it would work, sometimes not. Very confusing until I found the special function of those pins.
Another example I had is the PRU cape. It uses those pins, but the circuit attached is MOSFET input gates which are extremely high input resistance. With this sort of circuit, the boot process is unaffected. So it can be done, just be aware of the circuit you are attaching. Since none of my projects require more than a few GPIOs, I simply avoid using the pins which can impact boot. That's one nice thing about Beaglebone, it has a lot of GPIOs! Regards, Greg -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/f05e2d36-fa00-41c8-ab1c-b7303d76b5eb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
