Re: Tweaking pengutronix' debian packages for rt kernels

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

On Sat, Jan 01, 2011 at 06:25:23PM +0100, Nicholas Mc Guire wrote:
> On Sat, 01 Jan 2011, Arnout Engelen wrote:
> 
> > Hi,
> > 
> > http://www.pengutronix.de/software/linux-rt/debian_en.html mentions this 
> > would be the right place to discuss the Pengutronix Debian packages containing
> > RT-patched kernels.
> > 
> > Is there any guide that documents how to build tweaked versions of these 
> > packages? Pengutronix seems to be doing a great job, but for example the 
> > package for the 2.6.33.7.2-rt30 kernel doesn't contain the 'nouveau' graphics
> > driver, which I happen to use. 
> >
> 
> roughly:
> * apt-get install build-essential libncurses5-dev kernel-package
> * grab sources: http://debian.pengutronix.de/debian/pool/non-free/l/linux-2.6/linux-2.6_2.6.33.7.2-rt30.orig.tar.gz
>  Note that you can't verify the sources as no signature file is provided (bad)
>  ...or simply grab a verified kernel from kernel.org and the appropriate patch
Hmm, they should be verifiable using the normal Debian tools:

	http://debian.pengutronix.de/debian/dists/sid/Release is signed
	http://debian.pengutronix.de/debian/dists/sid/Release lists the
md5 and sha1 sum of non-free/source/Sources.gz
	http://debian.pengutronix.de/debian/dists/sid/non-free/source/Sources.gz  has the sums for
		linux-2.6_2.6.33.7.2-rt30.orig.tar.gz
		linux-2.6_2.6.33.7.2-rt30-1.diff.gz
		linux-2.6_2.6.33.7.2-rt30-1.dsc

This is what apt would check for you when you just do

	apt-get source linux-2.6

to grab and unpack the sources.  (You only need to pay attention that
you get the Pengutronix sources, not the Debian ones.  This depends on
the source lines in your sources.list and probably some configuration in
/etc/apt/preferences)
	
> * unpack sources
> * copy the config file to .config in the kernel source tree.
Note there are multiple config files that are all used to build the
config actually being used.

> * make menuconfig and add the driver you need
> * adjust /etc/kernel-pkg.conf (atleast maintainer and email - so you get blamed if you screwed up ;)
> * compile and sign package: CONCURRENCY_LEVEL=4 make-kpkg --pgpsign YOURNAME --initrd --append-to-version=-nouveau --revision=2.6.33.7 kernel-image kernel-source
For that you don't need the pengutronix sources.  The (IMHO) more
appropriate way is to edit config/config and then use

	debuild -us -uc

and then go and get you a coffee (or two).
> 
> Notes:
> * Note that you get a build failure on lenny as it does not find the utsreleas version in the right location for newer kernels (newer than 2.6.26 that is) so you have to manually cp include/generated/utsrelease.h include/linux/utsrelease.h and rerun the make-kpkg command
> * provide package AND sginature to the users of this package.
> * CONCURRENCY_LEVEL is just like -j4 here - so adjust to what is suitable for your compile box
You have to use DEBIAN_KERNEL_JOBS=4 for the way described above.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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