nct(4) - NetBSD Manual Pages

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NCT(4)                  NetBSD Kernel Interfaces 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 corre-
     sponding 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 10.1                    December 21, 2020                   NetBSD 10.1