From: Stefan Roese <sr@denx•de>
To: linuxppc-dev@ozlabs•org
Subject: Re: [PATCH] PPC440EPx SDRAM width
Date: Thu, 23 Apr 2009 16:05:22 +0200 [thread overview]
Message-ID: <200904231605.22912.sr@denx.de> (raw)
In-Reply-To: <20090423134538.GB3825@zod.rchland.ibm.com>
On Thursday 23 April 2009, Josh Boyer wrote:
> On Thu, Apr 23, 2009 at 09:36:12AM -0400, Steven A. Falco wrote:
> >There is an error in the way ibm4xx_denali_fixup_memsize calculates
> >memory size. When testing the DDR_REDUC bit, the polarity is
> >backwards. A "1" implies 32-bit wide memory while a "0" implies
> >64-bit wide memory.
> >
> >For a 32-bit wide system, this bug causes twice the memory to be
> >reported, leading to boot failure.
> >
> >Signed-off-by: Steven A. Falco <sfalco@harris•com>
>
> So we had a previous patch for this, and a very long discussion on what the
> right solution was. Either we never came to a resolution, or I have just
> forgotten what it was.
>
> Stefan, Valentine, do either of you remember?
Not really, sorry. Must be longer than 2 weeks ago, so it's already flushed
from my cache. :)
> IIRC, it wasn't something
> that effected Sequoia or Rainier, but it could (and obviously does) effect
> custom boards. I don't remember what we agreed on for the proper fix.
It would effect all 32-bit wide 440EPx/GRx boards using the boot wrapper. I
never used the wrapper on those platforms though. Sorry, I don't remember the
outcome of the discussion either.
Thanks,
Stefan
next prev parent reply other threads:[~2009-04-23 14:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 13:36 [PATCH] PPC440EPx SDRAM width Steven A. Falco
2009-04-23 13:45 ` Josh Boyer
2009-04-23 14:05 ` Stefan Roese [this message]
2009-04-23 14:40 ` Valentine Barshak
2009-04-23 14:59 ` Josh Boyer
2009-04-23 15:16 ` Valentine Barshak
2009-04-23 16:00 ` Steven A. Falco
2009-04-23 17:12 ` [PATCH] PowerPC: 440EPx/GRx Sequoia/Rainier U-Boot incorrect chipselect number workaround Valentine Barshak
2009-04-23 17:45 ` Steven A. Falco
2009-04-23 20:04 ` Valentine
2009-04-23 20:07 ` Josh Boyer
2009-04-23 20:12 ` Steven A. Falco
2009-04-23 20:55 ` [PATCH] PowerPC 44x: ibm4xx_denali_fixup_memsize fix Valentine Barshak
2009-04-24 4:23 ` Stefan Roese
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