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

[Ben Dooks]

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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