[Bug 210738] Can't set GPIO 47 on Raspberry Pi Zero.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210738

            Bug ID: 210738
           Summary: Can't set GPIO 47 on Raspberry Pi Zero.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: trasz at FreeBSD.org

Apparently the "ACT" LED on Raspberry Pi Zero is connected to GPIO 47. 
However, for some reason I can't set it using gpioctl(1):

root at rpi-b:~ # gpioctl -c 47 out
gpio_pin_set_flags: Invalid argument
root at rpi-b:~ # gpioctl 47 
1
root at rpi-b:~ # gpioctl 47 0
gpio_pin_set: Invalid argument

It looks completely normal in "gpioctl -lv":

pin 47: 1       pin 47<OUT>,
caps:<IN,OUT,PU,PD,UNKNOWN,UNKNOWN,UNKNOWN,UNKNOWN,UNKNOWN>

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