From: Wolfgang Denk <wd@denx.de>
To: Dan Malek <dan@netx4.com>
Cc: Lucinda Schafer <lucsch@adaptivemicro.com>,
linuxppc-embedded@lists.linuxppc.org
Subject: Re: Software Emulation Kernel Panic
Date: Tue, 13 Jun 2000 09:07:45 +0200 [thread overview]
Message-ID: <200006130707.JAA17893@denx.local.net> (raw)
In-Reply-To: Your message of "Mon, 12 Jun 2000 20:47:12 EDT." <39458490.234545FC@embeddededge.com>
In message <39458490.234545FC@embeddededge.com> Dan Malek wrote:
>
> > Wolfgang's suggestion makes a lot of sense to me:
> > "Usually this means that you are running on an old mask revision of
> > the CPU, which still has the (in)famous "Cache Corruption When
> > Writing to Special Registers" bug."
>
> I believe that only affected some 860(T) processors. I don't remember
> that listed for any other processor model or silicon.
Unfortunately, this silicon bug is present on the early mask
revisions of _all_ MPC8xx CPUs.
On the MPC823 it's listed as "CPU6. Possible Data Cache Curruption
With Special Purpose Register Access Located in Data Cache, Data MMU
or SIU" up to and including CPU revision 0.3 (mask set 3F98S); it
seems fixed in revision A (mask set 0H98G, 1H98G) and later.
For the MPC850 it's listed as "CPU7. Possible Data Cache Curruption
When Writing SPRs" up to and including CPU revision 0.3 (mask set
3F98S); it seems fixed in revision A (mask set 0H98G, 2H98G) and
later. I have a few samples of MPC850 CPUs labeled as 7F98S which are
not listed by Motorola, which are also affected.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
"No matter where you go, there you are..." - Buckaroo Banzai
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-06-13 7:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-12 20:16 Software Emulation Kernel Panic Lucinda Schafer
2000-06-13 0:47 ` Dan Malek
2000-06-13 7:07 ` Wolfgang Denk [this message]
-- strict thread matches above, loose matches on Subject: below --
2000-06-12 19:49 Wohlgemuth, Jason
2000-06-12 18:16 Lucinda Schafer
2000-06-12 19:43 ` Dan Malek
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