Updated: 2022/Sep/29

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NCT(4)                       Device Drivers Manual                      NCT(4)

NAME
     nct - Nuvoton NCT5104D SuperIO driver

SYNOPSIS
     nct0 at isa? port ?
     nct0 at isa? port 0x2e
     nct0 at isa? port 0x4e
     gpio* at nct?

DESCRIPTION
     The nct driver supports the GPIO functions of the NCT5104D.  The driver
     does not support the watchdog function of the chip.  The chip's UARTs are
     driven by the com(4) driver.

     The probe routine for this device is invasive.  The chip will be probed
     for only if the device is configured into the kernel with a fixed port
     number (0x2e or 0x4e), or if running on a system that is known to have a
     NCT5104D, such as the PC Engines APU line of systems.

     GPIO pins on this chip are shared with the 3rd UART, 4th UART, a clock
     input line, and the watchdog timer.  If any these functions have been
     enabled by the BIOS, the nct driver will not take control of the
     corresponding GPIO lines.  At attach time, the driver logs which of the
     17 GPIO lines are enabled.

SEE ALSO
     gpio(4), isa(4), gpioctl(8)

HISTORY
     The nct driver first appeared in NetBSD 10.

CAVEATS
     If the chip has not been configured in a complete and accurate manner by
     the BIOS, GPIO lines may be needlessly disabled.

NetBSD 10.99                   December 21, 2020                  NetBSD 10.99