RE: MPC8xx, FEC and DP83847 !?
From: Jean-Denis Boyer <hidden>
Date: 2002-03-21 18:55:44
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. -------------------------------------------- Jean-Denis Boyer, B.Eng., System Architect Mediatrix Telecom Inc. 4229 Garlock Street Sherbrooke (Québec) J1L 2C8 CANADA (819)829-8749 x241 -------------------------------------------- ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/