linux-kernel - Re: [PATCH 01/18] powerpc: Add ability to build little endian kernels

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Message-ID: <AANLkTimGtB_KoOgwk3Ujn2UcNzs9qHxzeZcb1ShLgcXh@mail.gmail.com>
Date:	Fri, 1 Oct 2010 07:28:30 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Ian Munsie <imunsie@....ibm.com>, Michal Marek <mmarek@...e.cz>,
	Albert Herranz <albert_herranz@...oo.es>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	paulus@...ba.org, Andreas Schwab <schwab@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Torez Smith <lnxtorez@...ux.vnet.ibm.com>
Subject: Re: [PATCH 01/18] powerpc: Add ability to build little endian kernels

On Fri, Oct 1, 2010 at 5:18 AM, Kumar Gala <galak@...nel.crashing.org> wrote:
>
> On Oct 1, 2010, at 2:05 AM, Ian Munsie wrote:
>
>>
>> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
>> index d361f81..074ff12 100644
>> --- a/arch/powerpc/platforms/Kconfig.cputype
>> +++ b/arch/powerpc/platforms/Kconfig.cputype
>> @@ -329,3 +329,19 @@ config CHECK_CACHE_COHERENCY
>>       bool
>>
>> endmenu
>> +
>> +config ARCH_SUPPORTS_LITTLE_ENDIAN
>> +     bool
>> +
>> +config CPU_LITTLE_ENDIAN
>> +     bool "Build little endian kernel"
>> +     depends on ARCH_SUPPORTS_LITTLE_ENDIAN && EXPERIMENTAL
>> +     default n
>> +     help
>> +       This option selects whether a big endian or little endian kernel will
>> +       be built.
>> +
>> +       Note that if building a little endian kernel, CROSS_COMPILE must
>> +       point to a toolchain capable of targetting little endian powerpc,
>> +       while the toolchain specified by CROSS32_COMPILE must be capable of
>> +       targetting *BIG* endian PowerPC.
>> --
>> 1.7.1
>
> Shouldn't we have something that limits to the sub-arch'es that actually support it?  I doubt I'm ever going to make FSL-Book-e support LE.

Yes, it should.

josh
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