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MOS(4) Device Drivers Manual MOS(4)

mosMosChip MCS7730/7830/7832 10/100 USB Ethernet device

mos* at uhub?

The mos driver provides support for USB Ethernet adapters based on the MosChip MCS7730, MCS7830 and MCS7832 USB 2.0 chipsets, including the following:

Delock 61147
Sitecom LN-030

All adapters operate with either USB 1.x or USB 2.0 controllers, though performance with 1.x controllers is limited since the USB 1.x standard specifies a maximum transfer speed of 12Mbps. Users with USB 1.x controllers should therefore not expect to actually achieve 100Mbps speeds with these devices.

A 64-bit multicast hash table is supported, single perfect filter entry for the station address, all-multicast mode, and promiscuous mode. Packets are received and transmitted over separate USB bulk transfer endpoints.

The mos driver supports the following media types:

Enable autoselection of the media type and options (this is the default). The user can manually override the autoselected mode by adding media options to the appropriate hostname.if(5) file.
Set 10Mbps operation.
Set 100Mbps (Fast Ethernet) operation.

The mos driver supports the following media options:

Force full-duplex operation.
Force half-duplex operation.

For more information on configuring this device, see ifconfig(8).

mos0: watchdog timeout
A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the transmission before a timeout expired.
mos0: no memory for rx list
The driver failed to allocate an mbuf for the receiver ring.

arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5), ifconfig(8)

MosChip India,

The mos device driver first appeared in OpenBSD 4.5.

The mos driver was written by Johann Christian Rode <>.

April 8, 2014 OpenBSD-6.3