From: Kalle Pokki <kalle.pokki@iki.fi>
To: Alex Zeffertt <ajz@cambridgebroadband.com>
Cc: dan@embeddedalley.com, linuxppc-embedded@ozlabs.org
Subject: Re: CPM2 early console
Date: Tue, 04 Oct 2005 12:16:39 +0200 [thread overview]
Message-ID: <43425687.9010801@iki.fi> (raw)
In-Reply-To: <20051004105917.27d93a91.ajz@cambridgebroadband.com>
Alex Zeffertt wrote:
>Hi Kalle, I've just checked and it makes no difference to the ATM
>driver. In fact, on my platform (PM828+u-boot-1.1.3) the pipeline
>depth was already set to 1.
>
>You are probably right that the pipeline depth was the cause of your
>problem- but my problem is something else. I think that Freescale
>simply overlooked the ATM external connection table case when
>designing the cache coherency protocol - because they offered no way
>to assert GBL when external connection tables are accessed.
>
>
The ATM in 8260 seems to have a huge errata list. Just quickly looking
at those at least CPM71: CPM does not snoop MCC buffer descriptors
sounds related, but it may be some other issue also. Do you already use
the microcode patch provided by Freescale?
I'm confident my problem was fixed with the correct setting of the
pipeline depth. I had trouble with everything related to cache
coherency, not just a single communication protocol.
next prev parent reply other threads:[~2005-10-04 10:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-22 16:02 CPM2 early console Rune Torgersen
2005-09-22 16:05 ` Kumar Gala
2005-09-23 10:55 ` Kalle Pokki
2005-09-27 14:11 ` Kalle Pokki
2005-09-27 16:39 ` Dan Malek
2005-09-27 20:35 ` Kalle Pokki
2005-09-27 20:48 ` Dan Malek
2005-09-28 10:20 ` Kalle Pokki
2005-09-29 12:24 ` Kalle Pokki
2005-09-29 12:50 ` Dan Malek
2005-09-30 13:22 ` Alex Zeffertt
2005-09-30 13:42 ` Alex Zeffertt
2005-09-30 20:16 ` Kalle Pokki
2005-09-30 13:58 ` Dan Malek
2005-09-30 20:10 ` Kalle Pokki
2005-09-30 20:28 ` Dan Malek
2005-10-01 5:57 ` Kalle Pokki
2005-10-01 8:24 ` Roger Larsson
2005-10-02 16:59 ` Dan Malek
2005-10-03 7:04 ` Kalle Pokki
2005-10-04 8:13 ` Kalle Pokki
2005-10-04 9:59 ` Alex Zeffertt
2005-10-04 10:16 ` Kalle Pokki [this message]
2005-10-04 16:04 ` Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2005-09-22 13:11 Kalle Pokki
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