---
name: "glxpcib"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/glxpcib"
---

# glxpcib(4)

AMD CS5536 PCI-ISA bridge with timecounter, watchdog timer, and GPIO

## NAME

**glxpcib** – AMD CS5536 PCI-ISA bridge with timecounter, watchdog timer, and GPIO

## SYNOPSIS

**glxpcib\* at pci?** **gpio\* at glxpcib?** **iic\* at glxpcib?** **isa\* at glxpcib?**

## DESCRIPTION

The **glxpcib** driver provides support for the AMD Geode CS5536 Companion chip. This device contains a number of components, including a PCI-ISA bridge. Besides the core functionality, the **glxpcib** driver implements a 32-bit 3.5 MHz timecounter, a watchdog timer device, a GPIO device, and an SMBus interface.

## SEE ALSO

[gpio(4)](/gpio/4.md), [iic(4)](/iic/4.md), [intro(4)](/intro/4.md), [isa(4)](/isa/4.md), [pci(4)](/pci/4.md), [pcib(4)](/pcib/4.md), [watchdog(4)](/watchdog/4.md), [gpioctl(8)](/gpioctl/8.md)

## HISTORY

The **glxpcib** driver first appeared in OpenBSD 4.3.

## AUTHORS

The **glxpcib** driver was written by Michael Shalayeff. The GPIO parts were added by Marc Balmer ⟨*mbalmer@openbsd.org*⟩.