[LAU] Building a Debian realtime kernel

[nescivi]

Hiho,

some more on this...
I had a problem using my RME Multiface with this kernel... It saw the PCMCIA 
card, but not the device. Tried my basic 2.6.29 kernel, that one had the same 
problem.
2.6.26 had no problem with it.

sincerely,
Marije

On Sunday 31 May 2009 20:47:43 nescivi wrote:
> Hiho,
>
> I've finally tried to make a realtime kernel for Debian, as posted on my
> site here: http://www.nescivi.nl/?p=111 (and also below, but without cross-
> references).
>
> However, I'm still getting xruns in jackd, at rather uncritical settings
> (large period sizes...).
>
> So I'm wondering what else could be going wrong...
>
> I also found it a bit weird that the Debian package building did not make
> the initrd image.
>
> sincerely,
> Marije
>
>
> ----------------------
>
> I’ve finally sat down and tried to make a realtime kernel for Debian, for
> my 64bit machine.
>  I followed the instructions I found in this post on the Debian forums.
> First, I got the Debian sources for 2.6.29, from my repository (so using
> synaptic).
> It puts the sources in /usr/src.
> Then I got the latest realtime patches from
> http://www.kernel.org/pub/linux/kernel/projects/rt/
> Then I made a dir in my home directory
>
>  mkdir kernel
>  cd kernel
>  cp /usr/src/linux-source-2.6.29.tar.gz .
>  tar -xf linux-source-2.6.29.tar.gz
>  mv linux-source-2.6.29 linux-2.6.29-source-rt
>  cd linux-2.6.29-source-rt
>  bzcat ../patch-2.6.29.4-rt16.bz2 |patch -p1
>
> I added this to the Makefile:
> EXTRAVERSION = -rt16
> To start from my current kernel configuration
>  make oldconfig
> Then I got a whole bunch of questions, most of which I answered taking the
> default options. Only for the realtime-preemption question I chose option
> 4, the realtime option.
> I looked at the options with menuconfig, but didn’t really change anything
> more there. The timer frequency mentioned in the post above seems to be
> preceded by the dynamic ticks option, which was turned on.
>  make menuconfig
> I had to unselect “staging” and the “comedi” drivers as these caused errors
> during building, and according to some messages on LAU I don’t really need
> it. Build a kernel the Debian way:
>  make-kpkg clean
>  time fakeroot make-kpkg --initrd -rev mz1 kernel_image kernel_headers
>
> To also build a source package:
>
>  time fakeroot make-kpkg --initrd -rev mz1 kernel_image kernel_headers
> kernel_source
>
> This will take a while.
> Your new kernel & headers now live in ../kernel Use dpkg -i to install (as
> root).
>  dpkg -i ../linux-headers-*.deb ../linux-image-*.deb
> So good so far… but the kernel didn’t boot yet…
>  and the initrd file was missing
> So with the initramfs-tools from the debian repository,
>  I did (as root)
>  mkinitramfs -o /boot/initrd.img-2.6.29-rt16 2.6.29-rt16
>  which created the initrd image.
> Also editing it appropriately in grub (/boot/grub/menu.lst) so that the
> boot process knows about it.
>
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