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LARTware - Ethernet boards
Specs
The Ethernet is a simple 10Base-T adapter for the LART. It connects through the
Kitchen Sink Board. The core of the board is a
Crystal CS8900A
Ethernet chip, which is supported by Linux. There's also the provision for a bootrom.
As there was some room left on the PCB, I added footprints for some FIFOs and a CPLD,
offering an 8-bit parallel output port suitable for, say, digital video I/O.
Schematics
Drivers
Both the Ethernet board and the built-in Ethernet on the rev4 KSB need a modified
Linux kernel driver.
| cs89x0.c | 6 Jul 2004 23:10:36 | 61,776 bytes |
Most recent version of the driver source. Tested with a 2.4.21-rmk1 kernel, may or may not work
on other kernel revisions. Thanks to Russ Dill, who provided a pretty good starting point for the modifications in this driver.
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Warning: stat() [function.stat]: stat failed for cs89x0-old.o in /home/lart/html/php-include/common.php3 on line 98
| cs89x0-old.o | 1 Jan 1970 01:00:00 | bytes |
Binary driver module for use with
this kernel. Download this file if you want a minimal ramdisk that includes this driver.
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| cs89x0-old.c | 9 Apr 2003 12:52:46 | 63,136 bytes |
Older version of the driver source. Tested with a 2.4.17-rmk3 kernel, may or may not work
on other kernel revisions.
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Usage
To use the Ethernet interface, you need to get an Ethernet address. An Ethernet
address, also known as MAC or hardware address, is a unique 48-bit number that
identifies a particular network interface (see
here for more info).
48-bit Ethernet addresses are usually written down as six two-digit hexadecimal numbers
separated by colons (example: 12:34:56:78:90:AB).
There are two ways to get an Ethernet address for your LART. The safest way is to take an
old, unused PC Ethernet card and to copy its Ethernet address. The not-so-safe way is to copy
the address from an Ethernet card which is in use on a network that you are
absolutely sure the LART will never be connected to.
Apart from the Ethernet address you will need an IP address, a broadcast address and a
netmask. See the Linux Networking
HOWTO for details. Given these four addresses, you can enable the Ethernet interface with three
commands:
- insmod cs89x0.o (to insert the driver into the kernel)
- ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx (where xx...xx is your Ethernet address)
- ifconfig eth0 IPADDR broadcast BCAST netmask NETMASK
Below is a sample of what it looks like. Ignore the "eth1:" messages; the driver is trying to find
a second Ethernet interface, loudly complaining about its absence.
lart #insmod cs89x0.o
Using cs89x0.o
eth0: cs8900 rev H found at 0xf6008300
cs89x0: No EEPROM, relying on command line....
cs89x0 media RJ-45,<4>cs89x0: Unable to autoprobe IRQ
what the heck, we just use IRQ 0
IRQ 0, programmed I/O, MAC 00:00:00:00:00:00
eth1: incorrect signature 0x1c0
eth1: incorrect signature 0x4848
eth1: incorrect signature 0x4848
cs89x0: probing 0x00008300
eth1: request_region(0xf6008300, 0x10) failed
cs89x0: probing 0x0000a300
eth1: incorrect signature 0xffff
cs89x0: probing 0x0000c300
eth1: incorrect signature 0x21
cs89x0: probing 0x0000e300
eth1: incorrect signature 0x0
cs89x0: no cs8900 or cs8920 detected. Be sure to disable PnP with SETUP
lart #ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
lart #ifconfig eth0 IPADDR broadcast BCAST netmask NETMASK
eth0: using half-duplex 10Base-T (RJ-45)
lart # |
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Note that all you will be able to do at this point is to ping the LART;
if you want services like a webserver, you will need to install them.
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