en(4)

NAME

en - device driver for Midway-based ATM interfaces

SYNOPSIS

To compile this driver into the kernel, place the  following
lines in your
kernel configuration file:
      device en
      device atm
      device utopia
Alternatively,  to load the driver as a module at boot time,
place the
following line in loader.conf(5):
      if_en_load="YES"

DESCRIPTION

The en device driver supports Midway-based ATM interfaces

including the
Efficient Networks, Inc. ENI-155 and Adaptec ANA-59x0. Mid

way is an AAL5
SAR (Segmentation and Reassembly) chip.

For configuring the card for IP see natmip(4).

The following sysctls are recognized by the driver addition

ally to those
handled by utopia(4):

hw.atm.enX.istats

Contains an array of uint32_t with internal driver

statistics.

hw.atm.enX.debug

This is a bit map of debugging options. This vari

able is only
available when the driver is compiled with debugging

support.

The driver supports the media options sdh, noscramb and

unassigned (see
utopia(4)).

DIAGNOSTICS

en0 <Efficient Networks ENI-155p> rev 0 int a irq 5 on

pci0:16
en0: ATM midway v0, board IDs 6.0, Utopia (pipelined), 512KB

on-board RAM
en0: maximum DMA burst length = 64 bytes
en0: 7 32KB receive buffers, 8 32KB transmit buffers allo

cated

CAVEATS

The driver extensively uses DMA on PCI. The first genera

tion PCI
chipsets do not work or exhibit poor performance.

SEE ALSO

natm(4), natmip(4), utopia(4), ifconfig(8), route(8)

AUTHORS

Chuck Cranor of Washington University implemented en driver

in 1996 for
NetBSD.

BSD July 16, 2005

BSD