I've used the second ball (and disabled the first) when it was required for a device. For example spi2_d1 uses P9.21b, so I disable P9.21a by setting it to PULL_DIS | MUX_MODE15. Be careful about pull-up/pull-down contention between connected balls. Use the same pull mode for both or set the unused ball to PULL_DIS.
If you haven't already use /opt/scripts/device/bone/show-pins.pl to get a nice summary of how things are configured. To use that script you first have to install a package: "sudo apt install libinline-files-perl". -- 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/74d312e5-f96e-43b9-a739-fa632f9ad536%40googlegroups.com.
