MPC8xx, FEC and DP83847 !?
Jean-Denis Boyer
jdboyer at mediatrix.com
Fri Mar 22 05:55:44 EST 2002
> In most cases you can just switch off the whole MDIO stuff and rely
> on autonegotiation; the only thing you lose is a kernel message when
> the link status changes. Of course this requires sane hardware, which
> is not always the case :-(
On full duplex connections, we have experienced problems with
the kernel-level BOOTP/DHCP. The offer returned by the server was not
caught. After investigating, it appeared that even though the PHY
auto-negociated correctly, the FEC was not aware of the full duplex
condition. I had to fix it by correctly reading the duplex mode
from the PHY, since this information should be given to the FEC.
It may also cause a 'working but deficient' communication,
especially under heavy traffic, since the collision detection should
be disabled in full duplex.
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Jean-Denis Boyer, B.Eng., System Architect
Mediatrix Telecom Inc.
4229 Garlock Street
Sherbrooke (Québec)
J1L 2C8 CANADA
(819)829-8749 x241
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