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en — device driver for Midway-based ATM interfaces
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
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