about FCC of MPC8270

li.chunlin at zte.com.cn li.chunlin at zte.com.cn
Wed Jul 4 14:24:13 EST 2007

hello, every one

   I have a board with mpc8270. And there are two ethernet interface by 
fcc1 and fcc2. Now in linux kernel 2.6.14 fcc1 is ok, but fcc2 is some 
wrong. I set loopback of fcc2 or rmii. that's ok. But i set loopback in 
phy, it is wrong. But fcc2 is ok in u-boot.

I take a look with oscillograph. i find that there is signal from fcc2 to 
phy and there is signal from phy to fcc2 in data pins. But fcc2 cannot 
receive data and fcc2 can send data.

who know the reason? Can you tell me? 


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