From: David Gibson <david@gibson.dropbear.id.au>
To: Ralph Blach <rblach@intrex.net>
Cc: Hollis Blanchard <hollis@austin.ibm.com>,
embedded list <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: DBCR0 reset?
Date: Wed, 30 Oct 2002 14:15:55 +1100 [thread overview]
Message-ID: <20021030031555.GM15643@zax> (raw)
In-Reply-To: <3DBF0764.10808@intrex.net>
On Tue, Oct 29, 2002 at 05:10:44PM -0500, Ralph Blach wrote:
> Hollis,
>
> The OS does this. I send you the info on how to disable it tommorrow.
Please send it to the list as well - I've encountered this problem as
well. Although it usually doesn't happen quite this quickly.
> Hollis Blanchard wrote:
> >Has anyone had problems with hardware breakpoints from external
> >debuggers? I'm using RISCWatch, which sets DBCR0 and IAC1 for me (yes
> >I've verified that). I'm then using 'echo > /proc/sys' to invoke my
> >code. However by the time I get to my sysctl proc handler, DBCR0 has
> >been reset from 0x80810000 to 0x00010000, hence IAC1 is ignored.
> >
> >I don't see much use of DBCR0, other than initialization and then save
> >during exception prologs and then restore during task restore. Can
> >anyone point me to where it might be reset?
> >
> >-Hollis
--
David Gibson | For every complex problem there is a
david@gibson.dropbear.id.au | solution which is simple, neat and
| wrong.
http://www.ozlabs.org/people/dgibson
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-10-30 3:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-29 19:18 DBCR0 reset? Hollis Blanchard
2002-10-29 22:10 ` Ralph Blach
2002-10-30 3:15 ` David Gibson [this message]
2002-10-30 19:52 ` Matt Porter
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