linux-kernel - Re: [PATCH] ARM: Explain workaround for faulty ISAR0 register on B15

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Message-ID: <CADtm3G5EN3juZ8=DaPLD_8vYN+-bWFq92=pzghWpahsq=-JiSA@mail.gmail.com>
Date:	Wed, 13 Aug 2014 11:53:59 -0700
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Matt Porter <mporter@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Mark Rutland <mark.rutland@....com>,
	Brian Norris <computersforpeace@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Marc Carino <marc.ceeeee@...il.com>,
	Kevin Cernekee <cernekee@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Gregory Fong <gregory.0xf0@...il.com>
Subject: Re: [PATCH] ARM: Explain workaround for faulty ISAR0 register on B15

On Mon, Aug 11, 2014 at 3:44 PM, Gregory Fong <gregory.0xf0@...il.com> wrote:
> The Brahma-B15 CPU design, like Krait, incorrectly indicates that it
> only supports UDIV and SDIV instructions in Thumb mode when it
> actually supports them in ARM and Thumb mode.  This is apparently
> because it follows the DDI0406B ARM ARM which has two values for the
> divide instruction field, instead of the DDI0406C ARM ARM which has
> three values.

NAK myself here. Brian Norris pointed out that this is incorrect, and
he'll send a follow-up patch to remove the forced hwcaps.  Sorry for
the noise.

Regards,
Gregory
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