From: Frank Bennett <bennett78@lpbroadband.net>
To: lokowich <lokowich@acdstar.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: SDRAM failures on MPC5200B
Date: Fri, 20 Jul 2007 11:03:40 -0600 [thread overview]
Message-ID: <46A0EAEC.9010607@lpbroadband.net> (raw)
In-Reply-To: <46A0D76E.4030101@acdstar.com>
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lokowich wrote:
> We're working on bringing up a MPC5200B version of our original
> MPC5200 board using U-Boot 1.1.4 configured for Icecube/Lite5200B.
> Other than the CPU, the board is identical. The bootloader crashes
> just after relocation to RAM, often with a Program Check Exception,
> typically a memory corruption issue. I noticed failures at different
> stages after relocation based on content, suggesting problems with
> upper SDRAM. If I force the initram to 1/2 the determined size (64MB
> instead of 128MB), then everything works well through kernel load and
> initialization. We've added termination resistors to improve AD
> signals, to no avail. Memory tests work fine too. Any help is
> appreciated.
Review MPC5200B errata data sheets. I found a BDI2000 + RS232 console
port most useful for turning on a new design. Even
the exercise of BDI commands to tftp load/verify, memory write/verify,
debugging u-boot to run out of ram, with & w/o cache
turned on can be enlightening.
/*/Frank Bennett
President/*/
Mathegraphics,LLC
613 Bentley Pl
Fort Collins,CO 80526
www.mathegraphics.com <http://www.mathegraphics.com/>_
_
>
> Thanks,
> Mark Lokowich
> Systems Engineer
> Advanced Communication Design
> 7901 12th Ave. So.
> Bloomington, MN 55425
> 952-854-4000
> lokowich@acdstar.com
> This email was Anti Virus checked by Astaro Security Gateway. http://www.astaro.com
> ------------------------------------------------------------------------
>
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
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next prev parent reply other threads:[~2007-07-20 21:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-20 15:40 SDRAM failures on MPC5200B lokowich
2007-07-20 16:46 ` Rafal Jaworowski
2007-07-20 17:03 ` Frank Bennett [this message]
2007-07-20 17:39 ` Florian A. Voegel
2007-11-13 13:59 ` lokowich
2007-11-13 14:40 ` Roman Fietze
2007-12-03 16:01 ` lokowich
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