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ELANSC(4) Device Drivers Manual (i386) ELANSC(4)

elanscAMD Elan SC520 System Controller with watchdog timer and GPIO

elansc* at pci?
gpio* at elansc?

The elansc driver supports the system controller of the AMD Elan SC520 microcontroller. The SC520 consists of an AMD Am5x86 processor core, integrated PCI host controller, and several standard on-chip devices, such as NS16550-compatible UARTs, real-time clock, and timers.

The Elan SC520 also provides several special on-chip devices. The following are supported by the elansc driver:

gpio(4), intro(4), watchdog(4), gpioctl(8), sysctl(8)

Support for the elansc was added in OpenBSD 3.3. PIO function support appeared in OpenBSD 3.6.

The elansc driver was written by Jason R. Thorpe <>. Jasper Wallace provided the work-around for a hardware bug related to the watchdog timer in some steppings of the SC520 CPU. Alexander Yurchenko <> added support for the PIO function.

August 14, 2013 OpenBSD-6.4