[U-Boot-Users] FEC problems on MPC5200

[Pierre AUBERT]

Hi everybody,

Wolfgang Denk wrote:

>In message <405AC56F.9020200 at staubli.com> you wrote:
>  
>
>>I've got some ethernet problems with a Lite5200.
>>    
>>
>...
>  
>
>>Has somebody experienced same problems on a MPC5200 ?
>>    
>>
>
>Yes, we see the same problem, and "bad length" errors. It  seems  the
>problem  was  introduced  by  one  of  the  patches lately. We're in-
>vestigating.
>
>
>Best regards,
>
>Wolfgang Denk
>
>  
>
I've made a lot of tries with the MPC5200 FEC. It appears that timeouts 
occurs
because some ACK frames aren't sent by the MPC5200 (but all is OK in 
mpc5xxx_fec_send).

The problem disappears if I suppress the full duplex (in 
fec->eth->x_cntrl and in the reg 0 of the LXT971A).
I can submit a patch.

But I have another question: if I suppress all the MII initialization 
sequence in cpu/mpc5xxx/fec.c, the LXT971A
reads its configuration from hardware and network is working fine at 10M 
and 100M on my Lite5200. The
auto-negociation works fine. Then, do we need to keep this (broken ?) 
init sequence ?
Is there something I have missed ?

Best regards