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Mon Jun 11 12:49:05 EDT 2018

changing pinmux at runtime

https://e2e.ti.com/support/arm/sitara_arm/f/791/t/591758?Linux-AM3358-Changing-pinmux-at-runtime

https://briancode.wordpress.com/2015/01/06/working-with-pwm-on-a-beaglebone-black/

Note that the state can be set like this,

root@beaglebone:~# echo pwm > /sys/devices/ocp.*/P9_14_pinmux.*/state

EDIT: This says:
NOTE: You CAN NOT use either SPI0 or SPI1 at runtime, IT MUST BE ENABLED AT BOOT in uEnv.txt 
https://elinux.org/BeagleBone_Black_Enable_SPIDEV




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