From: Rafal Jaworowski <raj@semihalf•com>
To: lokowich <lokowich@acdstar•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: SDRAM failures on MPC5200B
Date: Fri, 20 Jul 2007 18:46:31 +0200 [thread overview]
Message-ID: <46A0E6E7.3050309@semihalf.com> (raw)
In-Reply-To: <46A0D76E.4030101@acdstar.com>
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.
>
Assuming your RAM chips are fine, are you setting the SDelay register
(MBAR + 0x0190)? If not, this can lead to a strange hangs similar to the
described. For details please see the current U-Boot's initdram() for
icecube, and AN3221.
Rafal
next prev parent reply other threads:[~2007-07-20 17:06 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 [this message]
2007-07-20 17:03 ` Frank Bennett
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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