From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lucas Stach <dev@lynxeye.de>
Date: Mon, 02 Jul 2012 17:16:08 +0200
Subject: [U-Boot] [PATCH] arm: armv7: add compile option
 -mno-unaligned-access if available
In-Reply-To: <yw1xtxxqv69l.fsf@unicorn.mansr.com>
References: <1338918451-10126-1-git-send-email-dev@lynxeye.de>
	<4FCE52FB.3020501@wwwdotorg.org> <1338923180.1377.2.camel@tellur>
	<20120622111501.21e1fdcc@aari01-12> <4FEA21F5.4080803@gmail.com>
	<4FEADD13.2040708@kmckk.co.jp> <4FF16CF2.9090808@kmckk.co.jp>
	<yw1xtxxqv69l.fsf@unicorn.mansr.com>
Message-ID: <1341242168.1392.2.camel@tellur>
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

Am Montag, den 02.07.2012, 10:53 +0100 schrieb M?ns Rullg?rd:
> Tetsuyuki Kobayashi <koba@kmckk.co.jp> writes:
> 
> > Recent compiler generates unaligned memory access in armv7 default.
> > But current U-Boot does not allow unaligned memory access, so it causes
> > data abort exception.
> > This patch add compile option "-mno-unaligned-access" if it is available.
> 
> Why not allow unaligned accesses instead?
> 
IMHO, our recent discussion showed that both ways are wrong.
"-mno-unaligned-access" works around misaligned data on the software
level, while allowing unaligned access does on the hardware level.

What we really want is no unaligned access in U-Boot at all. Just
because "-mno-unaligned-access" is the default on ARMv5, we should not
consider it a gold standard.

Thanks,
Lucas