From: Andrew Lunn <andrew@lunn.ch>
To: eCos Maintainers <ecos-maintainers@ecos.sourceware.org>
Subject: FWD: [ECOS] Problem with PowerPC cache init order
Date: Mon, 21 Jun 2004 09:58:00 -0000 [thread overview]
Message-ID: <20040621095820.GD2031@lunn.ch> (raw)
Hi Folks
Could somebody who knows about PPC caches take a look at this patch.
Thanks
Andrew
----- Forwarded message from "Retallack, Mark (Siemens)" <mark.retallack@siemens.com> -----
From: "Retallack, Mark (Siemens)" <mark.retallack@siemens.com>
To: ecos-discuss@sources.redhat.com
Date: Mon, 14 Jun 2004 13:50:04 +0100
Subject: [ECOS] Problem with PowerPC cache init order
X-Spam-Status: No, hits=-4.7 required=5.0 tests=AWL,BAYES_00 autolearn=ham
version=2.63
I have found a problem with the PowerPC architecture hal.
The sequence for cache initialisation after reset (in hal_enable_caches)
should be:
unlock all
invalidate all
enable cache
Instead it is:
invalidate all
unlock all
enable cache
This can cause problems if there are sections of the cache that are locked
and contain invalid data. My target crashed with an exception when it needed
to do a copyback after a first time power up (not a pretty sight!!). The
copyback address was an invalid address.
I have attached a patch to fix the problem. This works for the MPC850, but I
do not know if it is correct for the complete PowerPC family.
<<my.patch>>
Mark Retallack
Graduate Engineer
Siemens Traffic Controls
Sopers Lane, Poole, Dorset. BH17 7ER. UK.
Tel: 01202 782844
Fax: 01202 782545
www.siemenstraffic.com
Committed to quality traffic solutions and service excellence
Siemens Traffic Controls is a division of Siemens plc. Registered No.
727817, England.
Registered office: Siemens House, Oldbury, Bracknell, Berkshire, RG12 8FZ.
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----- End forwarded message -----
next reply other threads:[~2004-06-21 9:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-21 9:58 Andrew Lunn [this message]
2004-06-21 10:21 ` Nick Garnett
2004-06-21 10:23 ` Andrew Lunn
2004-06-21 11:17 ` Gary Thomas
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