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

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Message-Id: <F7E7DAE6-A132-458D-ABC3-4CC92A4C7263@kernel.crashing.org>
Date:	Fri, 1 Oct 2010 04:18:20 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Ian Munsie <imunsie@....ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	benh@...nel.crashing.org, paulus@...ba.org,
	Michal Marek <mmarek@...e.cz>, Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Albert Herranz <albert_herranz@...oo.es>,
	Grant Likely <grant.likely@...retlab.ca>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	Torez Smith <lnxtorez@...ux.vnet.ibm.com>
Subject: Re: [PATCH 01/18] powerpc: Add ability to build little endian kernels


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.

- k--
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