toogle GPIO132 on BB xm rev C

Has anyone been able to successfully toggle the GPIO132 pin on the BB-
xM rev C.
I’ve tried :
- echo 132 /sys/class/gpio/ and echo "high" > gpio132
- Setting Mux Through u-boot
but nothing works.
I can toogle others gpio (GPIO136~140) but I need this pin (pin17 on
the expansion header)

Thank you.

Have you tried using devmem2 from within Linux to check that the CONTROL_PADCONF_x register has the muxmode set to GPIO?

Linux might be resetting all the muxes at boot time if I remember correctly.