[U-Boot-Users] transmission just works in loopback mode

Dear u-boot users,

i used the MPC875 FEC internal loopback mode and the external transceiver-loopback mode. In both cases i could send *and* receive the data.

But when using no loopback at all, but a (working) crossover cable to connect the board to a second PC (see below), no packets get received there. Where could the failure be ?

MPC875 <-> transceiver(LTX970) <-> RJ45-connector <-> crossover -cable <-> second PC with RJ54-connector

my custom board contains a MPC875, whose FEC is connected to a LTX970 transceiver chip, which uses a twisted pair cable interface.

best regards Josef