PING timeout on FCC1 / 2.6.26 / MPC8348 / fs_enet

[embedded]

I'm running into a strange problem when we ping the first Ethernet
device(FCC1) on our MPC8248 based board.  Note the second Ethernet
device runs without any problem(FCC2)

The network drops roughly 4-11% of the PINGS sent to it from either a
Windows or Linux system.  We've ran Ethernet compliance tests on the
boards and both Ethernets pass all tests, so electrically things seem
functional and within necessary Margins.  We've just used the second
port for most of out testing.

We are running linux (2.6.26 kernel) and strange enough, running the
ping tests, we've also started to notice a few eth0 FS_ENET_ERROR 0xc
/ 0x6, though they aren't showing up very regular.

Is there something obvious between the 2848/kernel/dts/fcc
configuration I should look for?  I don't think we've had this issue
in the past.


PING from Client PC
================
  Ping Timeout is seen in windows
  Bus traffic shows a missing reply from the MPC8248

Ping from the MPC8248
===================
  Dropped Pings are captured
  Bus traffic shows no missing replies.  Both the request and the
reply are on the network



ethtool eth0
==================
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Current message level: 0x00000000 (0)
        Link detected: yes

ethtool -i eth0
==================
driver: fs_enet
version: 1.0
firmware-version:
bus-info:

ethtool -d eth0
==================
Offset  Values
--------        -----
000:     20 00 00 3c 14 00 00 80 14 00 00 00 d5 55 00 00
010:     00 00 01 00 00 1b 00 00 00 00 00 00 00 00 00 00
020:     01 80 01 a0 00 00 06 00 30 00 00 00 07 95 e0 00
030:     8c 00 00 00 07 b6 00 10 30 04 00 11 07 95 e1 00
040:     00 00 00 00 00 00 00 00 07 95 e0 b0 07 95 e1 08
050:     be 26 a7 fd ff ff ff ff 00 00 00 00 5c 00 00 00
060:     00 00 00 00 de bb 20 e3 ff ff ff ff 00 00 00 00
070:     00 00 00 00 00 00 00 00 00 0f 00 00 00 00 00 00
080:     20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
090:     05 f6 d8 20 00 aa 06 00 00 00 00 08 00 08 00 00
0a0:     07 95 e1 00 30 00 5c 00 00 00 00 00 00 00 00 00
0b0:     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0c0:     00 00 00 00 00 00 00 00 00 40 01 00 00 5e 00 01
0d0:     01 c0 00 00 00 00 00 00 05 f0 05 f0 05 f0 05 f0
0e0:     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0f0:     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
100:     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
110:     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120:     00
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