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How to set pin mode on beaglebone black

Jason Rao
Prodigy 50 points


I can't find the file "omap_mux"  in /sys/kernel/debug,

so how to set pin mode on my beaglebone black with angstrom distribution?

many thanks!

  • 0
    TI__Mastermind 25235 points

    Hi Jason,

    The BeagleBone Black uses a new kernel - 3.8. The /sys/kernel/debug/omap_mux is gone and device trees are used to describe hardware. The 3.8 kernel uses Device Tree Overlays (DTO) for pin muxing.

    Here are some useful links to help you understand DTOs:

    https://github.com/jadonk/validation-scripts/tree/master/test-capemgr
    http://devicetree.org/Device_Tree_Usage
    http://hipstercircuits.com/adding-beaglebone-cape-support-to-a-kernel-with-device-tree-in-ubuntu/
    http://hipstercircuits.com/enable-pwm-on-beaglebone-with-device-tree-overlays/
    http://hipstercircuits.com/enable-spi-1-0-and-1-1-with-device-tre-overlays-on-beaglebone/

    Best regards,
    Miroslav

  • 0 in reply to Miroslav Kiradzhiyski XID
    Prodigy 50 points

    many thanks!!

    I'm trying to understand the device trees.

    but could you give me a web link to download the angstorm with 3.3 kernel?  the /sys/kernel/debug/omap_mux is a simple way for me to set pin mode

  • 0 in reply to Jason Rao
    TI__Mastermind 25235 points

    Hi Jason,

    As stated here, the BeagleBone kernels are implemented and maintained as a set of patches ahead of the mainline kernel, along with a script to download a mainline kernel and patch it accordingly. This is the same kernel (mainline and patches) which is in the Angstrom build.

    To Build a kernel, check out the beagleboard/kernel Github project, branch beaglebone-3.2 or branch 3.8. The README.md files contains exact steps for building the kernel and copying it to your BeagleBone.

    There is also this page with building instructions for the Angstrom distribution.

    Best regards,
    Miroslav