Re: Ethernet fails on MPC5200 based target

Andrea Galbusera wrote:

quoted

Maybe some things (like xlb pipelining, cache snooping, ...) is not properly
setup in you platform support code ?
    

Following your suggestion, I started from here... Comparing the
unaffected kernel (from DENX) with yours I tryed commenting out the
following in mpc52xx_setup_cpu() :

  /* Disable XLB pipelining */
  /* (cfr errate 292. We could do this only just before ATA PIO
     transaction and re-enable it after ...) */
  out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);

In fact this gives much better results, but does not completely solve
the problem. Network packets corruption seems to be gone, but, after
massive pinging (about 1k ping packets) it comes back with about the
same frequency as before the change.
  

And does the problem also appears on the denx kernel after 1k ping packets ?

Are the fec driver the same ?
Are the fec task code the same ? (in bestcomm/fec.c )

I can't figure out what is the impact of keeping XLB pipelining enabled
on the eth behavior. I'm sharing this results in the hope someone have
any other valuable suggestion
  

Well me neither, it should only affect performance, not create
corruption ...
AFAI understand it anyway.


    Sylvain