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EN(4)			 BSD Kernel Interfaces Manual			 EN(4)

     en — device driver for Midway-based ATM interfaces

     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):


     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):

	     Contains an array of uint32_t with internal driver statistics.

	     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

     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

     The driver extensively uses DMA on PCI.  The first generation PCI
     chipsets do not work or exhibit poor performance.

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

     Chuck Cranor of Washington University implemented en driver in 1996 for

BSD				 July 16, 2005				   BSD

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