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From: Kumar Gala <>
To: Roman Zippel <>
Cc: Sam Ravnborg <>,
	Linux Kernel list <>
Subject: Re: kbuild question
Date: Fri, 16 Feb 2007 08:14:40 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <Pine.LNX.4.64.0702161121540.14458@scrub.home>

On Feb 16, 2007, at 4:23 AM, Roman Zippel wrote:

> Hi,
> On Thu, 15 Feb 2007, Kumar Gala wrote:
>> I was wondering if there was some way to make a Kconfig menu  
>> either be just a
>> menu or a choice depending on another bool being set or not.
>> What I'm trying to accomplish is if CONFIG_ONLY_HAVE_ONE is set I  
>> want it so
>> you can only select on option, however if CONFIG_ONLY_HAVE_ONE is  
>> not set you
>> should be able to select multiple options.
> Could you please be more specific about the problem you're trying to
> solve, instead of how you're trying to solve it?
> A real example would help a lot to understand the actual problem.

Sure, on powerpc for some of the embedded sub-architectures you can  
only select a single board to build for.  For a lot of people this is  
sufficient, however we are moving towards a world where you can  
easily build in support for multiple boards into a single kernel.

I'd like to have it such that if I'm only building support for one  
board (CONFIG_ONLY_HAVE_ONE, not going to call it that, but for this  
discussion its sufficient), you get a choice menu from Kconfig  
enforcing the ability to only select one board.  However if ! 
CONFIG_ONLY_HAVE_ONE than you can select multiple boards to build  
into your kernel.

if CONFIG_ONLY_HAVE_ONE is set we can optimize out the runtime checks  
that get added for handling the multiple board case.

Hopefully that's clear.

- k

  reply	other threads:[~2007-02-16 14:15 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-15 19:18 Kumar Gala
2007-02-15 22:33 ` Sam Ravnborg
2007-02-15 23:44   ` Kumar Gala
2007-02-16  8:50     ` Sam Ravnborg
2007-02-16 10:23 ` Roman Zippel
2007-02-16 14:14   ` Kumar Gala [this message]
2007-02-18 17:16     ` Roman Zippel
2007-02-18 19:25       ` Sam Ravnborg
2007-03-15 15:22         ` Kumar Gala

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