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From: Stefan Roese <sr@denx.de>
To: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] 4xx: Workaround for CHIP_11 Errata
Date: Thu, 15 May 2008 17:16:43 +0200	[thread overview]
Message-ID: <200805151716.43397.sr@denx.de> (raw)
In-Reply-To: <20080515094346.3338e1f3@zod.rchland.ibm.com>

On Thursday 15 May 2008, Josh Boyer wrote:
> The PowerPC 440EP, 440GR, 440EPx, and 440GRx chips have an issue that
> causes the PLB3-to-PLB4 bridge to wait indefinitely for transaction
> requests that cross the end-of-memory-range boundary.  Since the DDR
> controller only returns the valid portion of a read request, the bridge
> will prevent other PLB masters from completing their transactions.
>
> This implements the recommended workaround for this errata for chips that
> use older versions of firmware that do not already handle it.  The last
> 4KiB of memory are hidden from the kernel to prevent the problem
> transactions from occurring.
>
> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

Acked-by: Stefan Roese <sr@denx.de>

Thanks.

Best regards,
Stefan

  reply	other threads:[~2008-05-15 15:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-15 14:43 [PATCH] 4xx: Workaround for CHIP_11 Errata Josh Boyer
2008-05-15 15:16 ` Stefan Roese [this message]
2008-05-15 20:31 ` Sean MacLennan
2008-05-15 21:07   ` Josh Boyer
2008-05-16  4:57     ` Stefan Roese

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