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From: Bastos Fernandez  Alexandre <ALEBAS@televes.com>
To: linuxppc-embedded@ozlabs.org
Date: Fri, 8 Jul 2005 08:37:52 +0200 
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Subject: RE: CPM2 reports CRC errors in FCC2 for good packets
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Hi,
Finally I got the problem solved. It was a hardware issue,
due mainly to my unknowledge.

For future archives searches ... the RX_ER line is reported
by CPM2 as a CRC error. And floating RX_ER is detected
as active.

Best regards,

Alex Bastos

> -----Original Message-----
> Hi guys,
> 
> I am working with a MPC8248 custom board. On this, we have mixed
> interfaces, with Ethernet on FCC1 working in Full Duplex 100Mbps,
> and MII-generic on FCC2, working in Half-Duplex 100Mbps.
> 
> On FCC2, CPM2 reports CRC error for each received packet, but
> ignoring it, packets arrive correctly. We have tested it with
> a known packet (ARP broadcast) through both interfaces, and this
> packet reports and CRC error on FCC2, but not in FCC1 ... but the
> received packet is the same in both cases !!! (taken from buffer
> pointed by RxBD):
> 
> # FCC2 : Generic-mii Half Duplex
> # ARP Broadcast Packet received on board!!!
> FF FF FF FF FF FF 00 10 5A A7 8A F3 08 06 00 01 08 00 06 04 00 01
> 00 10 5A A7 8A F3 0A 00 00 03 00 00 00 00 00 00 0A 00 00 01 00 00
> 00 00 00 00 00 00 00 00 00 0000 00 00 00 00 00 E7 E0 E9 46
> ... len: 64
> CBD_SC = 1C84 (crc_error)
> 
> 
> # FCC1 : ETHERNET Full Duplex
> # ARP Broadcast Packet received on board!!!
> FF FF FF FF FF FF 00 10 5A A7 8A F3 08 06 00 01 08 00 06 04 00 01
> 00 10 5A A7 8A F3 0A 00 00 03 00 00 00 00 00 00 0A 00 00 01 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E7 E0 E9 46
> ... len: 64
> 
> 
> So, packet is received ok, but CRC error is reported.
> Any idea? May it be a Hardware problem, even if packets are received
> OK by the driver?
> 
> 
> Thanks,
> 
> Alexandre BASTOS
> 
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