linux-kernel - Re: [PATCH] ARM: trusted_foundations: Maintain CPU endianness

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Date:	Fri, 20 Mar 2015 19:41:37 +0300
From:	Dmitry Osipenko <digetx@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: trusted_foundations: Maintain CPU endianness

20.03.2015 19:07, Stephen Warren пишет:
> On 03/20/2015 09:36 AM, Dmitry Osipenko wrote:
>> Convert CPU reset vector address to LE to support big-endian kernel.
>
> Naively this sounds a little odd; the value here is in a CPU register all the
> time, not in memory, so I'm not sure why endianness is relevant? Presumably the
> CPU doesn't end up byte-swapping values in registers when running in BE mode or
> it takes an SMC? If it does, why don't we need
> cpu_to_le32(TF_SET_CPU_BOOT_ADDR_SMC) too?
>
> Sorry if this is a silly question; I haven't followed any of the BE kernel patches.

You absolutely right. I goofed it by replacing 'smc' with 'str' without adding 
reg reverse for BE when was testing and then blindly made patch. Please ignore 
it and sorry for the noise.

-- 
Dmitry
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