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

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Date:	Wed, 04 Nov 2009 12:36:23 +0100
From:	Arnaud Patard <apatard@...driva.com>
To:	wuzhangjin@...il.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

Wu Zhangjin <wuzhangjin@...il.com> writes:

> 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.

It's a matter of taste : using 32 bit and getting an more or less broken
machine or using 64bit and getting a working machine. I don't think a
lot of people will choose the first option :)

Arnaud
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