linux-kernel - Re: [PATCH v3] watchdog: bcm2835: Fix poweroff behaviour

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Message-ID: <5582281F.8060402@wwwdotorg.org>
Date:	Wed, 17 Jun 2015 20:08:31 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Noralf Trønnes <noralf@...nnes.org>
CC:	linux-watchdog@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] watchdog: bcm2835: Fix poweroff behaviour

On 06/17/2015 08:04 AM, Noralf Trønnes wrote:
> Currently poweroff/halt results in a reboot on the Raspberry Pi.
> The firmware uses the RSTS register to know which partiton to
> boot from. The partiton value is spread into bits
> 0, 2, 4, 6, 8, 10. Partiton 63 is a special partition used by
> the firmware to indicate halt.
> 
> The firmware made this change in 19 Aug 2013 and was matched
> by the downstream commit:
> Changes for new NOOBS multi partition booting from gsh

Tested-by: Stephen Warren <swarren@...dotorg.org>
Acked-by: Stephen Warren <swarren@...dotorg.org>

I wonder if, sometime down the road, it's worth querying the firmware
version via the firmware driver and dynamically doing the right thing.
Still, the combination of a bleeding edge kernel and an ancient firmware
seems a bit unlikely, so perhaps not worth the bother.
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