---
name: "ebus"
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/ebus"
---

# ebus(4)

introduction to SPARC EBus bus support

## NAME

**ebus** – introduction to SPARC EBus bus support

## SYNOPSIS

**ebus\* at pci?** **ebus\* at mainbus0**

## DESCRIPTION

The **ebus** bus is designed to provide the ability to put ISA and traditional Intel-style peripherals in a SPARC based system with a minimal amount of glue logic. Typically, it is implemented in the PCIO IC from SME, which also implements an [hme(4)](/hme/4.md) compatible PCI network device (‘network’). The **ebus** has four DMA channels, similar to the DMA seen in the [esp(4)](/esp/4.md) SCSI DMA.

OpenBSD provides support for the following devices:

- [audioce(4)](/audioce/4.md)

  SPARC64 EBus CS4231 audio device

- [auxio(4)](/auxio/4.md)

  SPARC64 auxiliary I/O

- [bbc(4)](/bbc/4.md)

  SPARC64 BootBus Controller

- [beeper(4)](/beeper/4.md)

  console annunciator

- [clock(4)](/clock/4.md)

  real-time clock

- [com(4)](/com/4.md)

  serial communications interface

- [comkbd(4)](/comkbd/4.md)

  serial keyboard driver

- [comms(4)](/comms/4.md)

  serial mouse driver

- [led(4)](/led/4.md)

  SPARC64 LED driver

- [lom(4)](/lom/4.md)

  lights out management

- [lpt(4)](/lpt/4.md)

  parallel port driver

- [pcfiic(4)](/pcfiic/4.md)

  Philips PCF8584 I2C controller

- [pckbc(4)](/pckbc/4.md)

  PC (ISA) keyboard controller driver

- [pmc(4)](/pmc/4.md)

  power management controller

- [power(4)](/power/4.md)

  power button

- [sab(4)](/sab/4.md)

  Infineon SAB82532 (ESCC2) serial communications driver

- [uperf(4)](/uperf/4.md)

  performance counters driver

- [wbsd(4)](/wbsd/4.md)

  Winbond W83L518D/W83L519D SD memory card interface

## SEE ALSO

[intro(4)](/intro/4.md) Sun Microelectronics, *Peripheral Component Interconnect Input Output Controller*, Part No.: 802-7837-01, March 1997, http://www.sun.com/processors/manuals/802-7837.pdf.