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Re: [PATCH 2/16] arch related Makefile update for lemote fulong mini-PC

To: Zhang Fuxin <zhangfx@lemote.com>
Subject: Re: [PATCH 2/16] arch related Makefile update for lemote fulong mini-PC
From: Thiemo Seufer <ths@networkno.de>
Date: Mon, 16 Apr 2007 13:44:22 +0100
Cc: tiansm@lemote.com, linux-mips@linux-mips.org
In-reply-to: <4623387F.3070905@lemote.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <11766507651736-git-send-email-tiansm@lemote.com> <11766507661317-git-send-email-tiansm@lemote.com> <11766507661726-git-send-email-tiansm@lemote.com> <20070415222847.GA1402@networkno.de> <4623387F.3070905@lemote.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
Zhang Fuxin wrote:
> >> +cflags-$(CONFIG_CPU_LOONGSON2)    += -march=r4600 -Wa,--trap
> > 
> > I wonder why this is r4600. I heard the Loongson2 is MIPS IV compatible,
> > so r5000 / r8000 / r10000 would be better choices.
> 
> Presently Loongson-2E is nearly MIPS III compatible(with some
> self-defined extensions), next version will be mips64 release2 compatible.

I see.

> -march=r4600 is inherited from loongson-1, -march=mips3 might be a
> better choice.

Maybe. The 'mips3' maps to -march=r4000, it would assume more memory
latency and a slower integer divider then -march=r4600.


Thiemo

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