[U-Boot-Users] FEC problems on mpc852

Wolfgang Denk wd at denx.de
Tue Aug 12 17:43:03 CEST 2003

Dear Chris,

in message <3F38F620.4060207 at 2net.co.uk> you wrote:
> The problem occurs in fec_send (in cpu/mpc8xx/fec.c): the 
> BD_ENET_TX_READY bit is set but never cleared, indicating that the 
> packet is ready to send but the hardware is not processing it. The 
> receive side works fine: packets are received and processed as expected. 
> So, I do not suspect the physical path to the outside world. Anybody any 
> ideas what could cause this sort of behaviour? Any known problems with 
> the 852T? What can I look at to find out what is going on? By the way, 
> this is on u-boot 0.4.4.

Check the clock routing for your Tx side. Maybe there is no Tx  clock
so the bits don't get clocked out?

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"The more data I punch in this card,  the lighter it becomes, and the
lower the mailing cost."
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