From: Paul Mackerras <paulus@cs.anu.edu.au>
To: clepple@mitre.org
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: sync problem in arch/ppc/kernel/misc.S?
Date: Mon, 15 Mar 1999 16:02:43 +1100 [thread overview]
Message-ID: <199903150502.QAA16359@tango.anu.edu.au> (raw)
In-Reply-To: <36E93596.A055D7BB@mitre.org> (message from Charles Lepple on Fri, 12 Mar 1999 10:41:10 -0500)
Charles Lepple <clepple@mitre.org> wrote:
> Does anyone have any recollection of writing the comment "some chip revs
> have problems here..." in arch/ppc/kernel/misc.S? It's in the
> enable_interrupts subroutine, and on a DY4 603e board, I do seem to have
IIRC, the code there was cut-and-pasted by me from similar code
elsewhere, which had the comment in it already. I presume Gary Thomas
wrote that comment, since he did all the early work getting Linux
running on PPC. I wouldn't have thought that you would be having the
same problems on a 603e chip that Gary (presumably) came across on
some 601s.
> problems :-) It doesn't seem to be getting past this sync instruction,
> and I'm a little confused as to why not. Anyone with insights into this?
> (FWIW, the PVR is 0x60400, implying that it's not the 2.5V core chip...)
If you are getting a machine check apparently on a sync instruction,
it just means that an earlier instruction has access a bogus physical
address. One of the things that sync does is to wait for any
outstanding memory accesses to complete, so if one of them is bogus,
it will get reported at the sync instruction. Is it a machine check
you're getting or something else?
Paul.
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prev parent reply other threads:[~1999-03-15 5:02 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-03-12 15:41 sync problem in arch/ppc/kernel/misc.S? Charles Lepple
1999-03-15 5:02 ` Paul Mackerras [this message]
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