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.\" $FreeBSD: release/9.1.0/share/man/man4/en.4 208027 2010-05-13 12:07:55Z uqs $ .\" .Dd July 16, 2005 .Dt EN 4 .Os .Sh NAME .Nm en .Nd "device driver for Midway-based ATM interfaces" .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: .Bd -ragged -offset indent .Cd "device en" .Cd "device atm" .Cd "device utopia" .Ed .Pp Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : .Bd -literal -offset indent if_en_load="YES" .Ed .Sh DESCRIPTION The .Nm 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. .Pp For configuring the card for IP see .Xr natmip 4 . .Pp The following sysctls are recognized by the driver additionally to those handled by .Xr utopia 4 : .Bl -tag -width indent .It Va hw.atm.enX.istats Contains an array of .Vt uint32_t with internal driver statistics. .It Va 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. .El .Pp The driver supports the media options .Cm sdh , .Cm noscramb and .Cm unassigned (see .Xr utopia 4 ) . .Sh DIAGNOSTICS .Bd -literal 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 .Ed .Sh SEE ALSO .Xr natm 4 , .Xr natmip 4 , .Xr utopia 4 , .Xr ifconfig 8 , .Xr route 8 .Sh AUTHORS .An Chuck Cranor of Washington University implemented .Nm driver in 1996 for .Nx . .Sh CAVEATS The driver extensively uses DMA on PCI. The first generation PCI chipsets do not work or exhibit poor performance.