Re: [PATCH] arch: Kconfig: Let all little endian architectures define CPU_LITTLE_ENDIAN explicitly
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- To: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH] arch: Kconfig: Let all little endian architectures define CPU_LITTLE_ENDIAN explicitly
- From: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
- Date: Tue, 12 Aug 2014 11:27:42 +0800
- Cc: Arnd Bergmann <arnd@xxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Jean Delvare <jdelvare@xxxxxxx>, catalin.marinas@xxxxxxx, will.deacon@xxxxxxx, tony.luck@xxxxxxxxx, fenghua.yu@xxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, gxt@xxxxxxxxxxxxxxx, liqin.linux@xxxxxxxxx, lennox.wu@xxxxxxxxx, cmetcalf@xxxxxxxxxx, hskinnemoen@xxxxxxxxx, egtvedt@xxxxxxxxxxxx, james.hogan@xxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx
- In-reply-to: <20140811225326.GF30401@n2100.arm.linux.org.uk>
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- References: <53E93334.5000205@gmail.com> <20140811225326.GF30401@n2100.arm.linux.org.uk>
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On 8/12/14 6:53, Russell King - ARM Linux wrote:
> On Tue, Aug 12, 2014 at 05:18:44AM +0800, Chen Gang wrote:
>> x86, ia64, and arm(64) are little endian, and also another architectures
>> may be little endian (mips, sh, powerpc, and m32r) which already marked
>> CPU_LITTLE_ENDIAN explicitly.
>
> This is incorrect. ARM can be either endian.
>
> arch/arm/mm/Kconfig:
>
> config CPU_BIG_ENDIAN
> bool "Build big-endian kernel"
> depends on ARCH_SUPPORTS_BIG_ENDIAN
> help
> Say Y if you plan on running a kernel in big-endian mode.
> Note that your board must be properly built and your board
> port must properly enable any big-endian related features
> of your chipset/board/processor.
>
OK, thanks, I shall check all CPU_BIG_ENDIAN and send patch v2 for it.
And still welcome another ideas, suggestions or completions, especially
for another architectures.
Thanks.
--
Chen Gang
Open, share, and attitude like air, water, and life which God blessed
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