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FWD: [ECOS] Problem with PowerPC cache init order
- From: Andrew Lunn <andrew at lunn dot ch>
- To: eCos Maintainers <ecos-maintainers at ecos dot sourceware dot org>
- Date: Mon, 21 Jun 2004 11:58:20 +0200
- Subject: FWD: [ECOS] Problem with PowerPC cache init order
Could somebody who knows about PPC caches take a look at this patch.
----- Forwarded message from "Retallack, Mark (Siemens)" <email@example.com> -----
From: "Retallack, Mark (Siemens)" <firstname.lastname@example.org>
Date: Mon, 14 Jun 2004 13:50:04 +0100
Subject: [ECOS] Problem with PowerPC cache init order
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I have found a problem with the PowerPC architecture hal.
The sequence for cache initialisation after reset (in hal_enable_caches)
Instead it is:
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.
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