[U-Boot-Users] FEC problems on MPC5200

[U-Boot-Users] FEC problems on MPC5200

[Pierre AUBERT]

Hi everybody,

I've got some ethernet problems with a Lite5200.
During tftp transferts, I've got a lot of timeouts. I've put a network 
analyzer
on my ethernet, and I can see that all is ok on the server side (all the 
frames
are sent). It sounds like the Lite5200 missed some frames, because it 
doen't send
the  ACK.

Has somebody experienced same problems on a MPC5200 ?

Best regards.

Pierre

[U-Boot-Users] FEC problems on MPC5200

[Jón Benediktsson]

I see the same happen with my Lite5200.  I get frequent timeouts when
loading the kernel with TFTP.
It also happens when using the Motorola dbug boot monitor to load via TFTP.
Something seems to be wrong.
This happens very rarely when I am using our custom mpc823 board to load
from the same TFTP server,
but with Lite5200 it happens almost every time.

Regards,
Jon Benediktsson
Marel hf.

[U-Boot-Users] FEC problems on MPC5200

[Wolfgang Denk]

In message <405AC56F.9020200@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

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"Summit meetings tend to be like panda matings. The expectations  are
always high, and the results usually disappointing."   - Robert Orben

R: [U-Boot-Users] FEC problems on MPC5200

[Figini Enzo]

I have the same problem with my board (using MPC8280), but I don't know if
is a problem of the network (sometimes also ping fails - the switchs/routers
are not configured very well, I think) and/or is a problem of driver.

Enzo

[U-Boot-Users] FEC problems on MPC5200

[Pierre AUBERT]

J?n Benediktsson wrote:

>I see the same happen with my Lite5200.  I get frequent timeouts when
>loading the kernel with TFTP.
>It also happens when using the Motorola dbug boot monitor to load via TFTP.
>Something seems to be wrong.
>  
>
I also have the problem with dbug monitor. Is there any timeouts within 
Linux kernel ?

>This happens very rarely when I am using our custom mpc823 board to load
>from the same TFTP server,
>  
>
With other boards (based on MPC860T) we don't have any timeouts.

>but with Lite5200 it happens almost every time.
>
>Regards,
>Jon Benediktsson
>Marel hf.
>  
>
Regards

[U-Boot-Users] FEC problems on MPC5200

[Jón Benediktsson]

Pierre AUBERT <p.aubert@staubli.com> wrote on 19.03.2004 11:31:38:

> J?n Benediktsson wrote:
>
> >I see the same happen with my Lite5200.  I get frequent timeouts when
> >loading the kernel with TFTP.
> >It also happens when using the Motorola dbug boot monitor to load via
TFTP.
> >Something seems to be wrong.
> >
> >
> I also have the problem with dbug monitor. Is there any timeouts within
> Linux kernel ?

I have not observed this problem when using tftp in a Linux bash shell.
By this I mean I run tftp from a bash shell, turn on trace and do a 'get'
command
for a fairly large file.  All the sends and acks match up and there is no
observed
delay in the transfer.

>
> >This happens very rarely when I am using our custom mpc823 board to load
> >from the same TFTP server,
> >
> >
> With other boards (based on MPC860T) we don't have any timeouts.
>
> >but with Lite5200 it happens almost every time.
> >
> >Regards,
> >Jon Benediktsson
> >Marel hf.
> >
> >
> Regards

[U-Boot-Users] FEC problems on MPC5200

[Pierre AUBERT]

Hi everybody,

Wolfgang Denk wrote:

>In message <405AC56F.9020200@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