[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[Pierre AUBERT]

Hi everybody,

The attached patch fixes the FEC problems on my Lite5200 board. The network
is working without any problems at 10 and 100Mb. The auto-negociation 
works too.

If CONFIG_FEC_10MBIT is defined, the FEC works at 10Mb with Half-Duplex.
If CONFIG_FEC_10MBIT is undefined, the MII reads its configuration from 
hardware
and uses the auto-negociation for determining network speed.
The patch undefines CONFIG_FEC_10MBIT for the Lite5200.

Does it work for the other MPC5xxx boards ?


CHANGELOG:
* Patch by Pierre Aubert 25 Mar 2004
   Fix FEC problems on MPC5xxx: suppress timeouts on tftp.

Best regards

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[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[Wolfgang Denk]

In message <40629804.5060107@staubli.com> you wrote:
> 
> The attached patch fixes the FEC problems on my Lite5200 board. The network
> is working without any problems at 10 and 100Mb. The auto-negociation 
> works too.
> 
> If CONFIG_FEC_10MBIT is defined, the FEC works at 10Mb with Half-Duplex.
> If CONFIG_FEC_10MBIT is undefined, the MII reads its configuration from 
> hardware
> and uses the auto-negociation for determining network speed.
> The patch undefines CONFIG_FEC_10MBIT for the Lite5200.
> 
> Does it work for the other MPC5xxx boards ?

[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[Pierre AUBERT]

Wolfgang Denk wrote:

>In message <40629804.5060107@staubli.com> you wrote:
>  
>
>>The attached patch fixes the FEC problems on my Lite5200 board. The network
>>is working without any problems at 10 and 100Mb. The auto-negociation 
>>works too.
>>
>>If CONFIG_FEC_10MBIT is defined, the FEC works at 10Mb with Half-Duplex.
>>If CONFIG_FEC_10MBIT is undefined, the MII reads its configuration from 
>>hardware
>>and uses the auto-negociation for determining network speed.
>>The patch undefines CONFIG_FEC_10MBIT for the Lite5200.
>>
>>Does it work for the other MPC5xxx boards ?
>>    
>>
>
From what we saw, the FEC driver in U-Boot used to work quite stably,
>until the IDE support was added. May be that was just a  coincidence,
>but  it seems obvious to me that something changed in U-Boot recently
>that broke the FEC driver. It is possible that  "something"  was  not
>the IDE support in fact, but yet something else.
>  
>
On my side, I had the timeouts problems on tftp transferts from the 
begining.
IDE support didn't change anything, the problem exists before.

>The MII initialization code used to work fine for us, as  far  as  we
>were  able  to tell. Without having investigated this more closely, I
>will not check in this patch  as  I  feel  it  might  just  fix  some
>symptoms.
>  
>
For me, this init is useless, the MII takes its configuration from hardware.
On MPC8xx boards, there's no such init sequence and FEC works fine
for all boards.

>
>Best regards,
>
>Wolfgang Denk
>
>  
>

Best regards

[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[Wolfgang Denk]

In message <4062A3C1.40107@staubli.com> you wrote:
> 
> On my side, I had the timeouts problems on tftp transferts from the begining.
> IDE support didn't change anything, the problem exists before.

It would be interesting to know if there were some components in your
setup that you were not able to replace:

	LITE5200 board
	network cable(s)
	switch(es) / hub(s)
	TFTP server

Only if you were able to  replace  each  of  them,  and  the  problem
persisted, I am convinced of a problem with the code.

We had several boards, both with MGT5100 and MPC5200, with SDRAM  and
DDR,  in  several  layour  versions  of the IceCube / LITE board, and
additionally some custom boards. Never had that sort of problem until
around the time the IDE stuff was checked in.

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
I cannot draw a cart, nor eat dried oats;  If it be man's work I will
do it.

[U-Boot-Users] PATCH: fix FEC problems on MPC5200

[Pierre AUBERT]

Wolfgang Denk wrote:

>In message <4062A3C1.40107@staubli.com> you wrote:
>  
>
>>On my side, I had the timeouts problems on tftp transferts from the begining.
>>IDE support didn't change anything, the problem exists before.
>>    
>>
>
>It would be interesting to know if there were some components in your
>setup that you were not able to replace:
>
>	LITE5200 board
>	network cable(s)
>	switch(es) / hub(s)
>	TFTP server
>  
>
I've made some tests with several tftp servers (Unix servers and PC 
servers). Of course,
I've tried several cables and severals ports on several switches. I've 
also made some tests
with a direct connection between a PC and my Lite5200 with same results 
(in this case, timeouts
are rare, but it happens sometimes).
Unfortunately, I've got only one Lite5200 board but other people have 
same problems
(see thread 
http://sourceforge.net/mailarchive/forum.php?thread_id=4080201&forum_id=12898)
I think that my board is OK because I don't have any problem with the 
FEC under my
operating system.

>Only if you were able to  replace  each  of  them,  and  the  problem
>persisted, I am convinced of a problem with the code.
>
>We had several boards, both with MGT5100 and MPC5200, with SDRAM  and
>DDR,  in  several  layour  versions  of the IceCube / LITE board, and
>additionally some custom boards. Never had that sort of problem until
>around the time the IDE stuff was checked in.
>
>Best regards,
>
>Wolfgang Denk
>
>  
>
Best regards