Re: Linux on 440GP Networking issues

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Yep, the kernel tries to setup the second controller. But there is someting
very strange. Eventhough there is no network cable connected to the second
ethernet port , the OCP ENET driver says that it is 10Mbps, Link up and half
duplex.

The above is the default provided when autonegotiation doesn't turn up
anything useful, at least for the AMD Am79C875* PHYs (see ibm_ocp_phy.c:
mii_parse_Am79C875_pcr), which probably isn't the way to go.  And
handling of the "no link" case does seem to need some work.

Could verify whether the lockup is related to configuring 2 EMACs by a
hack to ppc405_enet_open to return -ENODEV if fep->emac_num > 0.  If
that boots fine then see if ppc405_eth_mal_dump shows registers such as
EMAC0's TXCTP0R or RXCTP0R changing values after EMAC1 is configured.
If so, that FIXME in the ppc405_enet_open code probably needs revisiting.


--
Todd


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"Todd" == Todd Poynor [off-list ref] writes:

    Todd> Could verify whether the lockup is related to configuring 2
    Todd> EMACs by a hack to ppc405_enet_open to return -ENODEV if
    Todd> fep->emac_num > 0.

Here's another data point.  I just got my ebony today, and in my
initial testing running nothing but the kernel and busybox, I got an
oops if I did "ifconfig" (looked like it came from somewhere near
register_gifconf).  I changed EMAC_NUMS in ibm440.h to 1 (from 2) and
now ifconfig works fine.

However, I didn't experience any crashes, even with EMAC_NUMS equal to
2, running with NFS root.

Best,
  Roland

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