From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: buildroot@busybox.net
Subject: [Buildroot] Kernel config and recommended books
Date: Wed, 28 Sep 2011 00:04:50 +0200 [thread overview]
Message-ID: <20110928000450.2d3a2f6b@skate> (raw)
In-Reply-To: <CAHvj1qY9ZzmuTzcE0W4V4dpErO-0FT4dXphAjA2VC6AFgT3oVw@mail.gmail.com>
Le Thu, 22 Sep 2011 22:29:45 +0100,
bruce bushby <bruce.bushby@gmail.com> a ?crit :
> I wanted to ask how I retain a kernel config ".config"? I'm trying to
> build a kernel for an OMAP3 Beagleboard .....so I run "make
> menuconfig" and select the bare basic but I change my login terminal
> to ttyS2 and for a "defconfig" I enter "omap2plus".
^^^^^ must be ttyO2 on OMAP platforms if you use a relatively
recent kernel (I don't remember if it's > 2.6.35 or > 2.6.37)
> console=ttyS2,115200n8
ttyO2
> So my question relates to the kernel ".config" .... before running
> make I don't have a kernel ".config" ... after running make I have:
> ./output/build/linux-3.0.4/.config
>
> and I think it's this file I need to change:
>
> [root at dlxarm01 buildroot-2011.08]# grep tty ./output/build/linux-3.0.4/.config
> CONFIG_CMDLINE="root=/dev/mmcblk0p2 rootwait console=ttyO2,115200"
> [root at dlxarm01 buildroot-2011.08]#
>
> that should be ttyS2....from what I've read on the net. So I take a
No, ttyO2 is correct. The "net" is outdated.
> copy of this file and I run a "make clean" .....but I can't put it
> back because the directory "./output/build/linux-3.0.4/" no longer
> exists.
Run 'make linux-menuconfig' will automatically open the kernel
menuconfig. Then, if you want to save your kernel configuration:
* Copy the output/build/linux-x.y.z/.config file somewhere
* Edit your Buildroot configuration, and instead of using the
omap2plus defconfig, tell Buildroot to use your own kernel
configuration.
> and lastly, what is considered the "defacto" book with regards to
> embedded linux kernels?
There is no defacto book, but for the configuration/compilation process
of the kernel, you might want to have a look at
http://www.kroah.com/lkn/.
Regards,
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
prev parent reply other threads:[~2011-09-27 22:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-22 21:29 [Buildroot] Kernel config and recommended books bruce bushby
2011-09-27 22:04 ` Thomas Petazzoni [this message]
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