Hi, I am using the PRU to write to P9 header pins of the beagle bone black. Load a device tree to configure the pins used by the PRU and this works fine (can toggle them with the PRU). Using mode 5 with pull down enabled. Disabled HDMI dt due to audio conflict. Enabled HDMIN dt (without audio).
After booting the beaglebone black: - pin P9_29 is high, while - pin P9_31 is low. Both pins have the same configuration in the device tree. I would like to have the pins low after booting. According the TRM, all pins are low initialized. So, somewere, pin P9_29 is explicitly set high during the boot process. This can be in u-boot, or in the linux kernel (I guess u-boot). I am unable to find where this happens. Searched in a lot of u-boot files, without luck. Can somebody give me a pointer to the place where the pin initialization is done? I am using the Debian 3.8.13-bone72 kernel: Linux beaglebone 3.8.13-bone72 #1 SMP Tue Jun 16 21:36:04 UTC 2015 armv7l GNU/Linux Thanks. -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
