---
name: "bmtphy"
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/bmtphy"
---

# bmtphy(4)

Broadcom Mini-Theta Ethernet PHY

## NAME

**bmtphy** – Broadcom Mini-Theta Ethernet PHY

## SYNOPSIS

**bmtphy\* at mii?**

## DESCRIPTION

The **bmtphy** driver supports the Broadcom Mini-Theta BCM5201 and BCM5202 10/100 Ethernet PHYs and their derivatives such as BCM4401, BCM5214, and BCM522x. It also supports the internal PHY on the 3Com 3C905C-TX 10/100 Ethernet interface, and the internal PHY on some 3Com 3C905B-TX 10/100 Ethernet interfaces. These PHYs are found on a variety of Ethernet interfaces.

## SEE ALSO

[ifmedia(4)](/ifmedia/4.md), [intro(4)](/intro/4.md), [mii(4)](/mii/4.md), [ifconfig(8)](/ifconfig/8.md)