linux-kernel - Re: [RFC PATCH] ARM: Add imprecise abort enable/disable macro

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Message-ID: <52F8E81E.70804@codethink.co.uk>
Date:	Mon, 10 Feb 2014 14:54:22 +0000
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Dave Martin <Dave.Martin@....com>
CC:	Fabrice GASNIER <fabrice.gasnier@...com>, linux@....linux.org.uk,
	u.kleine-koenig@...gutronix.de, jonathan.austin@....com,
	catalin.marinas@....com, will.deacon@....com, nico@...aro.org,
	sboyd@...eaurora.org, marc.zyngier@....com, vgupta@...opsys.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	maxime.coquelin@...com
Subject: Re: [RFC PATCH] ARM: Add imprecise abort enable/disable macro

On 10/02/14 14:16, Dave Martin wrote:
> On Fri, Feb 07, 2014 at 05:19:15PM +0100, Fabrice GASNIER wrote:
>> This patch adds imprecise abort enable/disable macros.
>> It also enables imprecise aborts when starting kernel.
>
> Relying on imprecise aborts for hardware probing would be considered bad
> hardware and/or software design for ARM-specific stuff.
>
> PCI is more generic though, so we may have to put up with this to some
> extent.  Can you point me to the affected probing code?  I'm not very
> familiar with that stuff...

The marvell pcie always had the option of delivering any bus
errors as imprecise aborts. However it was /annoying/ and therefore
easier just to turn it off and rely on the hardware returning 0xffff
for any configuration area it couldn't get to.


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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