On 10/19/2018 5:05 AM, TJF wrote: > With kernel 4.14.x on Beaglebone Black board (may Green and White as well) > after boot the pin P9_11 is in muxmode > > GPIO INPUT PULLUP > > , while the config-pin default is > > GPIO INPUT PULLDOWN > > Why that difference? Shouldn't the boot mode and the default mode be equal? > 13 further pins show that difference.
The default mode for P9_11 is an input with pull-up enabled: https://github.com/cdsteinkuehler/beaglebone-universal-io/blob/master/cape-universal-00A0.dts#L392-L393 The default pin modes for cape universal were set to match the reset defaults of the AM3358, so loading the universal device-tree overlay would not cause any physical change in the pin state. The reset default states are listed in the AM3358 data-sheet (which is a different document than the AM335x TRM). Most pins are are generally GPIO inputs with either a pull-up or pull-down (pin dependent) after reset. -- Charles Steinkuehler [email protected] -- 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/730b8d75-6940-8cd6-345e-29c7b29b07ab%40steinkuehler.net. For more options, visit https://groups.google.com/d/optout.
