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Driver for opencores ethernet MAC - README
------------------------------------------
The device name for the driver is 'open_eth1', the attach
function for the leon bsp is rtems_leon_open_eth_driver_attach().
No cache flushing is made when a frame is received. On leon,
this means that cache snooping must be configured in the
vhdl model and enabled by software.
TX interrupts are not used and masked in the interrupt mask
register.
For now, only 10 Mbit/s half-duplex is supported.
100 Mbit/s operations does not work reliably, the transmitter
locks up or skips frames. Seems to depend on the TX fifo
implementation in the opencores MAC. Send a mail to
jiri@gaisler.com if you know how to fix this.
Tested only on leon, using the GR-PCI-XC2V board @ 40 MHz.
Output from ttcp receiving 1 Mbyte file:
>>> ttcp -r -s
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp
ttcp-r: socket
ttcp-r: accept from 192.168.0.2
ttcp-r: 1145339 bytes in 1.18 real seconds = 947.88 KB/sec +++
ttcp-r: 792 I/O calls, msec/call = 1.53, calls/sec = 671.19
ttcp-r: 0.0user 1.1sys 0:01real 100% 0i+0d 0maxrss 0+0pf 0+0csw
************ MBUF STATISTICS ************
mbufs:1024 clusters: 128 free: 112
drops: 0 waits: 0 drains: 0
free:1007 data:17 header:0 socket:0
pcb:0 rtable:0 htable:0 atable:0
soname:0 soopts:0 ftable:0 rights:0
ifaddr:0 control:0 oobdata:0
************ INTERFACE STATISTICS ************
***** open_eth1 *****
Address:192.168.0.66 Broadcast Address:192.168.0.255
Flags: Up Broadcast Running Simplex
Send queue limit:50 length:0 Dropped:0
Rx Packets:796 Rx Interrupts:796 Length:0
Bad CRC:0 Overrun:0 Miss:0
Tx Interrupts:0 Deferred:0 Missed Hearbeat:0
No Carrier:0 Retransmit Limit:0 Late Collision:0
Underrun:0 Raw output wait:0
************ IP Statistics ************
total packets received 795
datagrams delivered to upper level 795
total ip packets generated here 401
************ TCP Statistics ************
connections accepted 1
connections established 1
conn. closed (includes drops) 1
segs where we tried to get rtt 2
times we succeeded 2
delayed acks sent 4
total packets sent 401
ack-only packets sent 6
window update-only packets sent 394
control (SYN|FIN|RST) packets sent 1
total packets received 795
packets received in sequence 792
bytes received in sequence 1145339
rcvd ack packets 2
bytes acked by rcvd acks 2
times hdr predict ok for data pkts 791
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