---
name: "cad"
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/cad"
---

# cad(4)

Cadence 10/100/1Gb Ethernet device

## NAME

**cad** – Cadence 10/100/1Gb Ethernet device

## SYNOPSIS

**cad\* at fdt?**

## DESCRIPTION

The **cad** driver supports the Cadence Gigabit Ethernet MAC core found on some SoCs, including the following:

- Microchip PolarFire SoC

- SiFive FU740-C000

- Xilinx Zynq-7000

The **cad** driver supports IPv4 receive IP/TCP/UDP checksum offload, and IPv6 receive TCP/UDP checksum offload.

The following media types and options are supported, as given to [ifconfig(8)](/ifconfig/8.md):

- media autoselect

  Use auto-negotiation for speed and duplex (default).

- media 1000baseT mediaopt full-duplex

  Use 1000baseT on copper, full duplex.

- media 100baseTX mediaopt full-duplex

  Use 100baseTX on copper, full duplex.

- media 100baseTX mediaopt half-duplex

  Use 100baseTX on copper, half duplex.

- media 10baseT mediaopt full-duplex

  Use 10baseT on copper, full duplex.

- media 10baseT mediaopt half-duplex

  Use 10baseT on copper, half duplex.

## SEE ALSO

[arp(4)](/arp/4.md), [ifmedia(4)](/ifmedia/4.md), [intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [hostname.if(5)](/hostname.if/5.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **cad** driver first appeared in OpenBSD 7.0