From: Geoff Levand <geoffrey.levand@am.sony.com>
To: "Mark A. Greer" <mgreer@mvista.com>
Cc: linuxppc-dev <Linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH] powerpc: Disable external interrupts in bootwrapper
Date: Tue, 27 Mar 2007 18:05:11 -0700 [thread overview]
Message-ID: <4609BF47.6030306@am.sony.com> (raw)
In-Reply-To: <20070327222840.GA1266@mag.az.mvista.com>
Mark A. Greer wrote:
> Disable external interrupts very early in the bootwrapper in case
> the firmware left a device generating interrupts.
This is just a guess at what is happening, but I think the OF on my
G5 uses the timer interrupt as a kind of watchdog timer, so that if
the loaded code hangs, OF will regain control. If you disable
interrupts, you may loose this functionality.
-Geoff
next prev parent reply other threads:[~2007-03-28 1:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 22:28 [PATCH] powerpc: Disable external interrupts in bootwrapper Mark A. Greer
2007-03-27 23:43 ` Paul Mackerras
2007-03-28 0:12 ` Mark A. Greer
2007-03-28 0:28 ` Benjamin Herrenschmidt
2007-03-28 1:03 ` Mark A. Greer
2007-03-28 1:26 ` David Gibson
2007-03-28 1:34 ` Mark A. Greer
2007-03-28 16:52 ` Segher Boessenkool
2007-03-28 1:05 ` Geoff Levand [this message]
2007-03-28 1:34 ` Mark A. Greer
2007-03-28 16:57 ` Segher Boessenkool
2007-04-10 22:37 ` Mark A. Greer
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