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Re: [PATCH 4/7] Support for ARM/U-Boot platforms

From: Francesco Lavra
Subject: Re: [PATCH 4/7] Support for ARM/U-Boot platforms
Date: Mon, 01 Apr 2013 16:29:02 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1

On 04/01/2013 01:24 PM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> On 01.04.2013 11:53, Francesco Lavra wrote:
>> On 04/01/2013 04:15 AM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>>> Which architecture is raspberry pie? I have one here and it would be
>>>> good if I could use it for testing.
>> It's ARMv6, so unfortunately it's not supported by this port, which
>> works only on ARMv7.
> Which parts prevent it from working on ARMv6?

I haven't studied ARMv6, but I can say that at least some assembly
instructions used by the cache maintenance code in kern/arm/cache.S
(such as DMB, DSB and ISB) have been introduced in ARMv7, as well as
some coprocessor operations (specifically, I'm looking at those used in
the clean_invalidate_dcache routine in the same file).

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