linux-kernel - Re: [RFC 01/23] ARM: LPAE: disable phys-to-virt patching on PAE systems

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Message-ID: <500E7C65.6040502@ti.com>
Date:	Tue, 24 Jul 2012 06:43:49 -0400
From:	Cyril Chemparathy <cyril@...com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nico@...aro.org" <nico@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Vitaly Andrianov <vitalya@...com>
Subject: Re: [RFC 01/23] ARM: LPAE: disable phys-to-virt patching on PAE systems

Hi Catalin,

On 7/24/2012 5:41 AM, Catalin Marinas wrote:
> On Tue, Jul 24, 2012 at 02:09:03AM +0100, Cyril Chemparathy wrote:
>> From: Vitaly Andrianov <vitalya@...com>
>>
>> The current phys-to-virt patching mechanism is broken on PAE machines with
>> 64-bit physical addressing.  This patch disables the patching mechanism in
>> such configurations.
>
> It may be broken, I don't remember whether I tested this feature. What's
> the PHYS_OFFSET on your platform? Is it within the low 4GB range?
>

At boot time PHYS_OFFSET is 0x80000000, in the low 4G range. 
Subsequently we switch over to the high PHYS_OFFSET at 0x800000000 (see 
patch 23/23 of this series).

-- 
Thanks
- Cyril
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