linux-kernel - Re: ARM defconfig files

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Date:	Fri, 04 Jun 2010 11:06:37 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Russell King <rmk@....linux.org.uk>
Cc:	Daniel Walker <dwalker@...eaurora.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: ARM defconfig files

On Thu, 2010-06-03 at 20:57 +0100, Russell King wrote:

> config MACH_HALIBUT
> 	bool "Halibut Board (QCT SURF7201A)"
> 	select I2C if STD_CONFIG
> 	select I2C_WHATEVER if STD_CONFIG
> 	...
> 
> That means if you enable STD_CONFIG, you'll get everything that's required
> selected.  If you then disable STD_CONFIG, I believe Kconfig leaves
> everything that was selected as still being selected.
> 
> So, what you _could_ do is start off with a blank configuration, then
> configure a kernel with STD_CONFIG enabled and you end up with everything
> that's required.  If you then want to disable something that's selected,
> turn off STD_CONFIG first, and you'll be able to turn off individual
> options.

The main problem with that approach is that you can't choose what is to
be modules and what is to be built-in.

Yes, I do -hate- modules as much as you do.

However, I have for example that little ARM based NAS box (DNS-323 from
Belkin) and the firmware on that thing won't let me boot a kernel that
is more than about 1.5M, tho I have about 6M of flash to put an
initramfs with modules in it.

Maybe we could extend select that way. IE. A way to say that a given
option should be y or m by default, for example, while the user can
still change it to be the other way around ?

Cheers,
Ben.

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