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

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.

CAVEATS

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

Debian                                            July 16, 2005                                            EN(4)