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

Josef Angermeier Josef.Angermeier at informatik.stud.uni-erlangen.de
Thu Feb 23 19:39:01 CET 2006


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




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