soekrisgpio —
Soekris net6501 GPIO and LEDs
soekrisgpio0 at isa? port 0x680
gpio* at soekrisgpio?
The soekrisgpio driver provides support for the GPIO and
  LEDs as implemented by the Xilinx Spartan FGPA integrated into the Soekris
  net6501 programmed with the default bitstream found in the BIOS.
Two standard
    gpio(4) interfaces are
    provided, one for the 16 real pins which can be configured as either inputs
    or outputs and another with 2 output-only pins that map to the error and
    ready LEDs respectively. Both may be used with
    gpioctl(8).
The soekrisgpio driver first appeared in
  NetBSD 7.0.
The soekrisgpio driver was written by
  Matt Dainty
  <matt@...> and imported from a
  patch for OpenBSD to NetBSD by
Frank Kardel
  <kardel@NetBSD.org>.
If the Xilinx FPGA is programmed with a different bitstream, the driver will
  likely not function.