Pinmux

Check the Pinmux status in OS

#
sudo cat /sys/kernel/debug/pinctrl/2430000.pinmux/pinconf-groups

# 
sudo cat /sys/kernel/debug/gpio

Using Pinmux to Enable Functions

For example, to enable UARTD

sudo busybox devmem 0x02434018 w 0x00000450

It looks an extra long path to