From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Becky Bruce <Becky.Bruce@freescale.com>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
Michael Schmitz <schmitz@zirkon.biophys.uni-duesseldorf.de>,
debian-powerpc@lists.debian.org,
Paul Mackerras <paulus@samba.org>
Subject: Re: 7447A strange problem with MSR:POW (WAS: can't boot 2.6.17-rc1)
Date: Fri, 14 Apr 2006 08:37:21 +1000 [thread overview]
Message-ID: <1144967841.4935.32.camel@localhost.localdomain> (raw)
In-Reply-To: <C7A11372-61BF-4EF7-9869-62B0FD5D8F44@freescale.com>
> FYI, the user's manual recommends this sequence:
> loop:
> sync
> mtmsr POW
> isync
> b loop
Ok, that's what OS X does... I always wondered ...
So ideally, we should do something similar to the above and set some
global bit somewhere telling the exception path to change the return
address. In either case, the actual form of the loop becomes fairly
irrelevant.
I need to verify what's up with the 970. I noticed Apple has some
additional weird tricks involving setting the DEC to a short value but
setting POW without EE (though I don't remember for sure, I should dbl
check their code). I suppose I should ask some IBM folks there.
Ben.
next prev parent reply other threads:[~2006-04-13 22:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44.0604071010290.18017-100000@zirkon.biophys.uni-duesseldorf.de>
[not found] ` <1144408805.30891.42.camel@localhost.localdomain>
[not found] ` <17463.9759.442768.685153@cargo.ozlabs.ibm.com>
2006-04-13 10:20 ` 7447A strange problem with MSR:POW (WAS: can't boot 2.6.17-rc1) Benjamin Herrenschmidt
2006-04-13 20:46 ` Becky Bruce
2006-04-13 20:55 ` Benjamin Herrenschmidt
2006-04-13 21:46 ` Becky Bruce
2006-04-13 22:37 ` Benjamin Herrenschmidt [this message]
2006-04-13 22:44 ` Olof Johansson
2006-04-14 19:07 ` Paul Mackerras
2006-04-14 19:54 ` Olof Johansson
2006-04-14 20:00 ` Becky Bruce
2006-04-14 22:57 ` Benjamin Herrenschmidt
2006-04-14 20:19 ` Paul Mackerras
2006-04-14 20:24 ` Olof Johansson
2006-04-14 21:09 ` Becky Bruce
2006-04-14 21:01 ` Benjamin Herrenschmidt
2006-04-18 5:45 ` Paul Mackerras
2006-04-18 6:00 ` Benjamin Herrenschmidt
2006-04-18 6:32 ` Paul Mackerras
2006-04-18 6:37 ` Benjamin Herrenschmidt
2006-04-18 14:56 ` Olof Johansson
2006-04-18 16:03 ` Olof Johansson
2006-04-15 11:12 ` Michael Schmitz
2006-04-18 19:29 Becky Bruce
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