From: Scott Wood <scottwood@freescale.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, Bob Cochran <ppc@mindchasers.com>,
support@abatron.ch
Subject: Re: [RFC] [PATCH] powerpc: Add MSR_DE to MSR_KERNEL
Date: Fri, 1 Jun 2012 17:42:51 -0500 [thread overview]
Message-ID: <4FC9456B.8090400@freescale.com> (raw)
In-Reply-To: <1338589800.16119.58.camel@pasglop>
On 06/01/2012 05:30 PM, Benjamin Herrenschmidt wrote:
> BTW. My point of view is that this whole business about MSR:DE is a HW
> design bug. There should be -no- (absolutely 0) interaction between the
> SW state and the HW debugger for normal operations unless the user of
> the debugger explicitly wants to change some state.
I agree entirely, and e500mc at least has less of this than e500v2 (not
sure if it still needs MSR[DE], but supposedly it doesn't have the
requirement for there to be a valid instruction at the debug vector,
which is lots of fun when booting). But this isn't exactly something
Freescale is going to replace existing chips over.
Getting all the way to zero interaction would require a completely
separate debug facility so software can debug at the same time. I'd be
all for that (and let's throw in a third, for the hypervisor), but I'm
not the one that needs to be convinced.
-Scott
next prev parent reply other threads:[~2012-06-01 22:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 7:43 [RFC] [PATCH] powerpc: Add MSR_DE to MSR_KERNEL Joakim Tjernlund
2012-05-30 7:59 ` Dan Malek
2012-05-30 12:08 ` Re[2]: " Abatron Support
2012-05-31 9:05 ` Joakim Tjernlund
2012-05-31 9:30 ` Re[4]: " Abatron Support
2012-05-31 9:56 ` Joakim Tjernlund
2012-05-31 17:47 ` Scott Wood
2012-05-31 21:38 ` Joakim Tjernlund
2012-05-31 21:43 ` Scott Wood
2012-05-31 22:14 ` Joakim Tjernlund
2012-05-31 22:16 ` Scott Wood
2012-05-31 22:33 ` Joakim Tjernlund
2012-05-31 22:35 ` Joakim Tjernlund
2012-07-20 8:27 ` Zang Roy-R61911
2012-07-20 8:37 ` Joakim Tjernlund
2013-06-25 0:51 ` Scott Wood
2013-06-25 6:00 ` Joakim Tjernlund
2013-06-26 21:42 ` Scott Wood
2012-06-01 9:12 ` Re[2]: " Benjamin Herrenschmidt
2012-06-01 10:34 ` Joakim Tjernlund
2012-05-30 13:26 ` Bob Cochran
2012-06-01 9:14 ` Benjamin Herrenschmidt
2012-06-01 10:38 ` Joakim Tjernlund
2012-06-01 16:28 ` Scott Wood
2012-06-01 22:30 ` Benjamin Herrenschmidt
2012-06-01 22:42 ` Scott Wood [this message]
2012-06-01 23:24 ` Benjamin Herrenschmidt
2012-06-02 18:29 ` Joakim Tjernlund
2012-06-02 21:21 ` Benjamin Herrenschmidt
2012-06-03 9:20 ` Joakim Tjernlund
2012-06-04 9:06 ` Joakim Tjernlund
[not found] ` <OF7810EBD9.B191A242-ONC1257A13.0031E9E3-C1257A13.00320D10@LocalDomain>
2012-07-11 14:24 ` Joakim Tjernlund
2012-07-11 14:45 ` Kumar Gala
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