linux-kernel - RE: [PATCH] ARM: pxa: support 806MHz operating points for PXA31x processors A2 stepping

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Date:	Tue, 22 Feb 2011 17:33:19 -0800
From:	Haojian Zhuang <hzhuang1@...vell.com>
To:	Eric Miao <eric.y.miao@...il.com>, Axel Lin <axel.lin@...il.com>
CC:	Igor Grinberg <grinberg@...pulab.co.il>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] ARM: pxa: support 806MHz operating points for PXA31x
 processors A2 stepping



>-----Original Message-----
>From: Eric Miao [mailto:eric.y.miao@...il.com]
>Sent: 2011年2月22日 9:19 PM
>To: Axel Lin; Haojian Zhuang
>Cc: Igor Grinberg; linux-kernel@...r.kernel.org; Russell King; linux-
>arm-kernel@...ts.infradead.org
>Subject: Re: [PATCH] ARM: pxa: support 806MHz operating points for
>PXA31x processors A2 stepping
>
>>> Another thing (which could be related to the patch) is the package
>marking.
>>> We have PXA3xx SoCs marked A2 stepping, but C624, which means that
>the
>>> highest running frequency should not exceed 624MHz.
>>
>> This means not all PXA310 A2 stepping supports 806Mhz.
>> Can we differentiate the Cxxx option in software?
>>
>>> What is your PXA3xx A2 marking in respect to Cxxx option?
>>
>> Mine is 88AP310-A2-BGK2C806.
>>
>
>Haojian,
>
>Can you help check on the stepping/markings on these processors
>to see which of them supports 806MHz, reliably?
>
>- eric

Hi Eric,

There's no way to recognize 806MHz on PXA310 A2 since not all A2 chips 
can support 806MHz. The only way to recognize 806MHz is to read marks on
the top of chip.

Thanks
Haojian