[U-Boot] Random problem on MPC8640D based board

[Thirumalai]

Dear Denx,

----- Original Message ----- 
From: "Wolfgang Denk" <wd at denx.de>
To: "Thirumalai" <thirumalai.p at datapatterns.co.in>
Cc: <u-boot at lists.denx.de>
Sent: Wednesday, May 05, 2010 12:38 PM
Subject: Re: [U-Boot] Random problem on MPC8640D based board


> Dear "Thirumalai",
>
> In message <0C0A8ED2EDFB487097801B3175C0F2CD at itd210> you wrote:
>>
>> Sorry. Trap 200 is Machine check exception. Also sometimes we are getting
>> TRAP 300 which is DSI exception.
>
> It doesn't really matter which exception you are seeing. Fact is the
> system is not running stable. Culprit # 1 in such situations is the
> RAM not working stable.
>
>> > Did you try booting Linux on that board?  Let me guess: if you tried,
>> > it crashed, right?
>>
>> No. It is not crashing. Linux is booting on this board successfully. Its 
>> a
>> random issue.
>
> How do you run Linux? Did you try running with root file system
> mounted over NFS, and adding some real load, like compiling some
> sources?
>

We are running with rootfile system mounted over NFS. we have used lmbench 
and ltp for load.

>> > I recommend to check the RAM initialization sequence. I bet you see
>> > memory corruption effects.
>>
>> What you meant for memory corruption effects?
>
> I mean that your RAm is not working reliably. See the FAQ:
> http://www.denx.de/wiki/view/DULG/UBootCrashAfterRelocation
>
> Best regards,
>
> Wolfgang Denk
>
> -- 
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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