From: "Ивайло Димитров" <freemangordon@abv.bg>
To: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: pdeschrijver@nvidia.com, pali.rohar@gmail.com, tony@atomide.com,
linux@arm.linux.org.uk, linux-kernel@vger.kernel.org,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm: omap: RX-51: ARM errata 430973 workaround
Date: Wed, 6 Mar 2013 11:32:12 +0200 (EET) [thread overview]
Message-ID: <107742828.129755.1362562332955.JavaMail.apache@mail81.abv.bg> (raw)
>-------- Оригинално писмо --------
>От: Aaro Koskinen
>Относно: Re: [PATCH] arm: omap: RX-51: ARM errata 430973 workaround
>До: Ивайло Димитров
>Изпратено на: Събота, 2013, Март 2 01:51:39 EET
>
>
>On Fri, Mar 01, 2013 at 12:09:12PM +0200, Ивайло Димитров wrote:
>> Unfortunately it is necessary, on RX-51 PPA/NOLO leaves IBE bit unset.
>
>You sure? I think you need to explain this more - the commit message in
>the original patch is empty/missing...
>
>A.
>
Yes, I am sure, NOLO leaves IBE bit in ACR unset, I've verified that by reading/printing the contents of ACR from both u-boot and the kernel itself. With IBE bit unset, "mcr p15, 0, rX, c7, c5, 6" - flush BTAC/BTB instruction(which is needed to workaround errata 430973) is a noop.
Yes, I am sure, IBE but must be set by using a call to PPA, on RX-51 setting that bit from the kernel (as it is done in the "ARM errata: Stale prediction on replaced interworking branch" kernel patch, see http://kerneltrap.org/mailarchive/git-commits-head/2009/5/3/5622724) does not work, see the comment at the end: "Note that setting specific bits in the ACTLR register may not be available in non-secure mode.". This is exactly the case for RX-51. I've verified that too.
If you need anything else elaborated on, I'm fine, just ask :)
Regards,
Ivo
next reply other threads:[~2013-03-06 9:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-06 9:32 Ивайло Димитров [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-03-30 22:31 [PATCH] arm: omap: RX-51: ARM errata 430973 workaround Ивайло Димитров
2013-03-31 7:37 ` Pavel Machek
2013-03-28 5:30 Ивайло Димитров
2013-03-28 15:58 ` Tony Lindgren
2013-03-01 10:09 Ивайло Димитров
2013-03-01 23:51 ` Aaro Koskinen
2013-03-01 7:47 Ивайло Димитров
2013-03-01 14:38 ` Nishanth Menon
2013-03-04 18:58 ` Tony Lindgren
2013-03-06 14:09 ` Pali Rohár
2013-03-06 17:51 ` Tony Lindgren
2013-03-06 19:13 ` Pali Rohár
2013-03-24 14:26 ` Pali Rohár
2013-03-27 20:56 ` Tony Lindgren
2013-03-27 21:05 ` Pali Rohár
2013-03-27 21:12 ` Tony Lindgren
2013-03-28 9:50 ` Russell King - ARM Linux
2013-03-28 10:07 ` Santosh Shilimkar
2013-03-28 15:53 ` Tony Lindgren
2013-02-28 9:42 Pali Rohár
2013-02-28 14:40 ` Nishanth Menon
2013-03-01 9:43 ` Peter De Schrijver
2013-03-30 18:36 ` Pavel Machek
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