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From: "Laurent Lagrange" <lagrange@fr.oleane.com>
To: <linuxppc-embedded@ozlabs.org>
Subject: 82xx fcc_enet problem between Linux 2.4 and 2.6
Date: Thu, 31 Aug 2006 19:46:27 +0200
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Hello,

I work on several custom 82xx boards with Linux 2.4 and 2.6.

I have ported Linux 2.6.9 on different boards and I noticed
that I have tx carrier errors on my FCC ports. Almost one
error per xmit.

I reinstalled Linux 2.4.18 on these boards and I have NO ERROR.

The errors arise with PHY configured in 100M full duplex (or autoneg).
The FCC has the same duplex as PHY.

I found on web another mail concerning a problem on PQ2FADS Linux2.6.8
when mounting a NFS. The writer has also noticed that he has
tx carrier errors but the mail focused on mount and not FCC.

> # ifconfig
> eth0      Link encap:Ethernet  HWaddr 08:00:17:40:00:03
>           inet addr:192.168.0.5  Bcast:192.168.0.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:122 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:114 errors:0 dropped:0 overruns:0 carrier:114
>           collisions:0 txqueuelen:1000
>           RX bytes:20747 (20.2 kb)  TX bytes:14320 (13.9 kb)
>           Base address:0x8500

I think this is not a phy or hardware problem but rather a FCC configuration
mismatch in fcc_enet.c.

Thanks for any tips
Laurent