linux-kernel - Re: ARM defconfig files

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Date:	Fri, 4 Jun 2010 00:33:39 +0300
From:	Tony Lindgren <tony@...mide.com>
To:	Russell King <rmk@....linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: ARM defconfig files

* Russell King <rmk@....linux.org.uk> [100603 21:07]:
> On Thu, Jun 03, 2010 at 07:46:23PM +0300, Tony Lindgren wrote:
> > Compiling in multiple ARM platforms is trickier, we would have to get
> > rid of the duplicate defines like NR_IRQS, then have some common clock
> > framework etc. Then figure out some way to get rid of Makefile.boot.
> > Russell probably has some other things in mind that would have to be
> > changed to make this happen.
> 
> - Find someway to handle the wide variety of interrupt controllers.
> - Be able to handle any multitude of V:P translations, including non-linear
>   alongside linear transations.
> - Different PAGE_OFFSETs
> - Different kernel VM layouts allowing for a variety of different ioremap
>   region sizes

Some of these could be handled by allowing building a seprate instance
for each platform compiled in. Maybe we could set them up with symlinks.

How about a minimal generic relocatable ARM kernel and then we load the
platform support as a module from ramdisk? :)
 
> and so the list goes on...

Yeah..
 
> > That way maybe you can wait a bit longer for the other defconfigs
> > and as an extra bonus I won't get flamed for removing these omap
> > defconfigs ;)
> 
> Note that Linus is talking about removing all but one or two ARM
> defconfigs - which means your omap3_defconfig will probably be
> eventually culled.

Yes but I also think we need to do something about this.

Regards,

Tony
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