So far, I learned that I can poke the GPIO register to make it work:
poke32(0x50000300+0x518, 1 << 11)
poke32(0x50000300+0x50c, 1 << 11)
poke32(0x50000300+0x508, 1 << 11)
This works and blinks the LED. Thanks for the pointer - my test program (without Espruino) is able to write to this port using nrf_gpio_pin_write successfully (through with SDK 15.2). I will try to narrow it down and see why it doesn't work from within Espruino.
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