From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shinya Kuribayashi <skuribay@pobox.com>
Date: Tue, 15 Mar 2011 08:54:12 +0900
Subject: [U-Boot] [PATCH v2 3/5] MIPS: Optimize the setup of endianess
 and CPU optimization flags
In-Reply-To: <1300137298-23836-4-git-send-email-daniel.schwierzeck@googlemail.com>
References: <1300137298-23836-1-git-send-email-daniel.schwierzeck@googlemail.com>
	<1300137298-23836-4-git-send-email-daniel.schwierzeck@googlemail.com>
Message-ID: <4D7EAAA4.7070309@pobox.com>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

On 3/15/11 6:14 AM, daniel.schwierzeck at googlemail.com wrote:
> Replace the current MIPSFLAGS code by cc-option macro and use
> -march=mips32r2 as default optimization level for all Mips32 CPUs.
> Replace the endianess determination code from toolchain prefix by
> a more generic one inspired by the Linux arch/mips/Makefile.
[...]
> -ifneq (,$(findstring 4KCle,$(CROSS_COMPILE)))
> -ENDIANNESS = -EL
> -else
> -ENDIANNESS = -EB
> -endif
> +# Optimization flags for all Mips32 CPUs
> +MIPSFLAGS = $(call cc-option,-march=mips32r2,-mips32r2 -Wa,-mips32r2)
>
> -MIPSFLAGS += $(ENDIANNESS)
> +# Determine endianess from toolchain prefix
> +ENDIANESS = $(shell $(CC) -dumpmachine | \
> +		grep -q 'mips.*el-.*'&&  echo -EL || echo -EB)
> +
> +PLATFORM_CPPFLAGS += $(MIPSFLAGS) $(ENDIANESS)
>
> -PLATFORM_CPPFLAGS += $(MIPSFLAGS)

This trick can not work with the ELDK toolchain, which also I don't
want to think about and be involved in discussion any more.   See:

http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/81572/focus=81735

Users who need to dig into this area should install the ELDK first,
build little-endian targets with it by yourself, then find a way
to handle endianness appropriately which works for both the ELDK and
non-ELDK toolchains.

Or I may miss something.  If it's already verified with the ELDK,
please let me know, thanks.