From: lokowich <lokowich@acdstar.com>
To: linuxppc-embedded@ozlabs.org
Subject: Re: SDRAM failures on MPC5200B
Date: Tue, 13 Nov 2007 07:59:56 -0600 [thread overview]
Message-ID: <4739ADDC.8010402@acdstar.com> (raw)
In-Reply-To: <46A0D76E.4030101@acdstar.com>
A follow-up: The first version of our termination network was based on
the Lite5200 reference design, but was confirmed by Freescale to be
inadequate. We revised the hardware per their errata, terminating both
ends of the data bus. This fixed the problem. Thanks for the helpful
feedback.
Mark
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.
>
> Thanks,
> Mark Lokowich
> Systems Engineer
> Advanced Communication Design
> 7901 12th Ave. So.
> Bloomington, MN 55425
> 952-854-4000
> lokowich@acdstar.com
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next prev parent reply other threads:[~2007-11-13 13:59 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
2007-07-20 17:39 ` Florian A. Voegel
2007-11-13 13:59 ` lokowich [this message]
2007-11-13 14:40 ` Roman Fietze
2007-12-03 16:01 ` lokowich
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