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EN(4)		       FreeBSD Kernel Interfaces Manual			 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.  Midway 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	additionally 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 variable 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 allocated

CAVEATS
     The driver	extensively uses DMA on	PCI.  The first	generation 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.

FreeBSD	10.1			 July 16, 2005			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | CAVEATS | SEE ALSO | AUTHORS

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