linux-kernel - Re: [PATCH 02/18] powerpc: Add CROSSBE_COMPILE to build big endian boot wrapper

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Date:	Fri, 1 Oct 2010 09:13:19 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ian Munsie <imunsie@....ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	benh@...nel.crashing.org, Michal Marek <mmarek@...e.cz>,
	Albert Herranz <albert_herranz@...oo.es>, paulus@...ba.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 02/18] powerpc: Add CROSSBE_COMPILE to build big endian
 boot wrapper

On Fri, Oct 1, 2010 at 09:05, Ian Munsie <imunsie@....ibm.com> wrote:
> From: Ian Munsie <imunsie@....ibm.com>
>
> Since the boot wrapper must be built by a big endian 32bit toolchain
> regardless of what the rest of the kernel is using introduce a new
> parameter to specify that toolchain - CROSSBE_COMPILE.
>
> We already have CROSS32_COMPILE which is already used for the boot
> wrapper, but it is also used to build the 32bit vdso which should be
> build in the same endianness as the rest of the kernel, so it is
> necessary to be able to specify the toolchain to build the boot wrapper
> separately from that used to build the vdso and again separately from
> that used to build the main kernel.
>
> CROSSBE_COMPILE should be pointed to a toolchain capable of targeting
> 32bit big endian powerpc, either specifically targetted at 32bit or
> bi-arch 64 and 32bit. If CROSSBE_COMPILE is not specified it will fall
> back to CROSS32_COMPILE to maintain compatibility with big endian
> targets.

Shouldn't the help text added by [PATCH 01/18]:

+++ 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.

be updated here as well?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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