el man page on BSDOS

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EL(4)			    BSD Programmer's Manual			 EL(4)

NAME
     el - 3Com EtherLink 16 (3C507) Ethernet interface

SYNOPSIS
     el0 at isa? port 0x310 iomem 0xd0000 iosiz 65536

DESCRIPTION
     The el interface provides access to a 10 Mb/s Ethernet network.  It uses
     a software-selectable block of 16 i/o ports in range 0x200 through 0x3f0.
     The block must be aligned on a 16 port boundary.  The card also uses port
     0x100 to configure the base port.	The shared memory window is pro-
     grammable and its base address and size should be specified in the system
     configuration file.  Size of a memory window can be 16, 32, 48 or 64
     kilobytes; the base address can be 0xc0000, 0xc8000, 0xd0000 and 0xd8000
     (16/32Kb windows only).  The hardware interrupt level is programmable and
     is selected during autoconfiguration time or can be specified in the sys-
     tem configuration file.  Supported irqs are: 2(9), 3, 5, 7, 10, 11, 12,
     15.  This card should be installed in a 16-bit slot.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl.	 The el interface employs the address resolution pro-
     tocol described in arp(4) to dynamically map between Internet and Ether-
     net addresses on the local network.

MEDIA SELECTION
     The 3C507 supports software-selectable 10BASE-2/BNC and AUI/DIX inter-
     faces.  The interface flag IFF_LINK0 selects TP (twisted pair) when set.
     See ifconfig(8) for details.

DIAGNOSTICS
     The following diagnostics may be printed during autoconfiguration:

     el%d: illegal base port number 0x%x

     Invalid port specification in kernel config file.

     el%d: illegal RAM address/size combination (0x%x, %d)

     Invalid iomem or iosize specification in kernel config file.

     el%d: no irq available

     Automatic interrupt selection was enabled, but all usable interrupts had
     already been claimed by other devices.

     el%d: unsupported IRQ number %d

     Invalid irq specification in kernel config file.

SEE ALSO
     intro(4),	inet(4),  arp(4)

BUGS
     The system supports only one el interface per machine.  This is a hard-
     ware limitation.

HISTORY
     The el driver first appeared in BSDI.

BSDI BSD/OS		       January 14, 1994				     1
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