From: santosh.shilimkar@ti.com (Santosh Shilimkar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: do not mark CPU 0 as hotpluggable
Date: Fri, 22 Jul 2011 10:26:07 +0530 [thread overview]
Message-ID: <4E2902E7.6000108@ti.com> (raw)
In-Reply-To: <20110721133033.GN26574@n2100.arm.linux.org.uk>
On 7/21/2011 7:00 PM, Russell King - ARM Linux wrote:
> On Thu, Jul 21, 2011 at 11:03:04AM +0530, Santosh Shilimkar wrote:
>> Just talking on behalf of OMAP, we can't offline CPU0 and limitation
>> would remain in future OMAPs too.
>
> Apart from the broken IRQ migration, and the way CPU0 immediately
> reawakes if it is offlined on OMAP4 (even when IRQs are migrated off
> CPU0) because omap_read_auxcoreboot0() returns 0, is there any other
> reason?
>
> With fixed IRQ migration and forcing CPU0 into an infinite WFI loop,
> I can offline CPU0 and still have a running system.
>
The secure software runs only on CPU0 and that's the biggest limitation.
Other issues like hand-shake as you pointed out, power sequencing etc
can be worked around.
Regards
Santosh
next prev parent reply other threads:[~2011-07-22 4:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-20 23:32 [PATCH] ARM: do not mark CPU 0 as hotpluggable Mike Turquette
2011-07-21 3:02 ` Rob Herring
2011-07-21 5:33 ` Santosh Shilimkar
2011-07-21 13:30 ` Russell King - ARM Linux
2011-07-22 4:56 ` Santosh Shilimkar [this message]
2011-07-22 12:45 ` Woodruff, Richard
2011-07-22 12:53 ` Santosh Shilimkar
2011-08-12 1:31 ` Turquette, Mike
2011-07-21 7:45 ` Russell King - ARM Linux
2011-07-21 21:22 ` Woodruff, Richard
2011-07-21 22:18 ` Turquette, Mike
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