linux-kernel - Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support

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Date:	Wed, 04 Nov 2009 19:04:12 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Arnaud Patard <apatard@...driva.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	LKML <linux-kernel@...r.kernel.org>, huhb@...ote.com,
	yanh@...ote.com, Zhang Le <r0bertz@...too.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>, zhangfx@...ote.com,
	liujl@...ote.com
Subject: Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support

Hi,

On Wed, 2009-11-04 at 11:28 +0100, Arnaud Patard wrote:
[...]
> > +
> > +config CPU_LOONGSON2F
> > +	bool "Loongson 2F"
> > +	depends on SYS_HAS_CPU_LOONGSON2F
> > +	select CPU_LOONGSON2
> > +	help
> > +	  The Loongson 2F processor implements the MIPS III instruction set
> > +	  with many extensions.
> > +
> > +	  Loongson2F have built-in DDR2 and PCIX controller. The PCIX controller
> > +	  have a similar programming interface with FPGA northbridge used in
> > +	  Loongson2E.
> > +
> 
> Small question : Why don't you restrict to 64bit kernels only ? From
> what I remember from some discussions with ST, trying to use a 32-bit
> kernel on 2f is a nice way to get troubles. It would be better imho to
> forbid such a configuration. As a side effect, this will remove all
> 'defined(CONFIG_64BIT)' parts of your #ifdef tests. 
> 

It's hard to make such a decision ;) Perhaps some guys want to play with
the 32bit version.

Regards,
	Wu Zhangjin

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