Realtime kernel build quickie + bootsplash (or not)

[alidh]

Thanks, but can't find libncurses5-dev in my lenny/sid mixed sourcelist/ system...

[mzilikazi]

It's there.

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# apt-cache policy libncurses5-dev
libncurses5-dev:
  Installed: 5.6+20080203-1
  Candidate: 5.6+20080203-1
  Version table:
 *** 5.6+20080203-1 0
        500 http://ftp.us.debian.org testing/main Packages
        500 http://ftp.us.debian.org unstable/main Packages
        100 /var/lib/dpkg/status
     5.5-5 0
        500 http://ftp.us.debian.org etch/main Packages

[alidh]

[/code]# Processor type and features> Preemption Mode (Complete Preemption (Real-Time))
bash: syntax error near unexpected token `('
[/code]

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# Processor type and features>Timer frequency (1000 HZ)
bash: syntax error near unexpected token `('

I'll keep having this message although I've install:

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# apt-cache policy libncurses5-dev
libncurses5-dev:
  Geïnstalleerd (installed): 5.6+20080203-1

[mzilikazi]

Not sure why you get that error. Did you apply the proper patch to the proper kernel source? The last good rt kernel that I have used is 2.6.23.1-rt5. I already have the patched source available here should you care to try it.

[alidh]

Not sure why you get that error. Did you apply the proper patch to the proper kernel source? The last good rt kernel that I have used is 2.6.23.1-rt5. I already have the patched source available here should you care to try it.

patched source? So I can skip these commands?

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wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.24.tar.bz2
wget ftp://ftp.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.24-rt1.bz2
wget http://fatcat.ftj.agh.edu.pl/~przyboro/other/bootsplash/bootsplash-3.1.6-2.6.24.diff
unp linux-2.6.24.tar.bz2
cd linux-2.6.24
patch -p1 <../bootsplash-3.1.6-2.6.24.diff
bzcat ../patch-2.6.24-rt1.bz2|patch -p1
cd ..
mv linux-2.6.24/ linux-2.6.24-rt1

When I skip this and start I'll get:

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:~/kernels/linux-2.6.23.1-rt5$ make menuconfig
make: *** Er is geen regel om doel 'menuconfig' te maken.  Gestopt.

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make: *** There's no line to make goal 'menuconfig'. Stopped

[mzilikazi]

Use wget to fetch the source.

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wget http://www.hotlinkfiles.com/files/646109_jx15j/linux-2.6.23.1-rt5.bz2
unp linux-2.6.23.1-rt5.bz2
cd linux-2.6.23.1-rt5
make oldconfig
make menuconfig

Then continue on as usual.

[alidh]

It's not a quickie build for me

When I want to unpack the file I'll get:

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bzcat: Compressed file ends unexpectedly;
        perhaps it is corrupted?  *Possible* reason follows.
bzcat: Success
        Input file = linux-2.6.23.1-rt5.bz2, output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

linux-2.6.23.1-rt5/fs/nfs/nfs4state.c
linux-2.6.23.1-rt5/fs/nfs/nfs4proc.c
tar: Onverwacht einde-van-bestand in archief
tar: Onverwacht einde-van-bestand in archief
tar: Fout is niet herstelbaar -- tar sluit nu af.
studio32:/home/dirk/kernels#                     

[mzilikazi]

I just downloaded and extracted the tarball and it was fine. Did you use wget to download the file or a web browser? wget is the preferred method. Also you can check the md5sum:

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md5sum linux-2.6.23.1-rt5.bz2

Result should be:

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0d4b48f1a0890d2bccd58ad4eb862980  linux-2.6.23.1-rt5.bz2

Then just extract it

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tar xjvf linux-2.6.23.1-rt5.bz2

[jongi]

Can I add that I like running the process in an X environment when I compile a kernel. Thus I use sux - and make xconfig and then load the relevant config-xx.x.x.x.x from /boot.

[jongi]

typically how long does it take for a rt patch? I see 2.6.24.5 has no rt patches.

[mzilikazi]

typically how long does it take for a rt patch? I see 2.6.24.5 has no rt patches.

Looks like it was skipped but I see that 2.6.24.7 & 2.6.25.4 just showed up
http://www.kernel.org/pub/linux/kernel/projects/rt/

[jongi]

yeah i compiled against 2.6.25.4 a couple of days ago.

[Hadret]

So, I tried compiling once more, without result. Here's what I do:

1) Get kernel source
2) Patch it with RT
3) Compile kernel
4) Install kernel
5) Restart computer and chose new kernel on boot time
6) I do install NVIDIA drivers (without any problem) [m-a a-i nvidia]
7) I restart computer once more
X.org doesn't start - I get only black screen

What is wrong? Is realtime prempt patch x86 only? Or there's something else?

[mzilikazi]

What is wrong? Is realtime prempt patch x86 only? Or there's something else?

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modprobe nvidia
/etc/init.d/gdm start

or

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/etc/init.d/kdm start

I always thought it easier to build the nvidia module against your new kernel before booting into it. To do this, you must be in the same dir as your kernel source. See the bottom of the howto for that.

[Hadret]

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modprobe nvidia
/etc/init.d/gdm start

or

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/etc/init.d/kdm start

I don't use any of these (rungetty r0xx). In kernel 2.6.25 from repositories, NVIDIA drivers are working just fine, only when I compile my own kernel they doesn't work

]I always thought it easier to build the nvidia module against your new kernel before booting into it. To do this, you must be in the same dir as your kernel source. See the bottom of the howto for that.

I'll give it a try, thank you! (:

[Hadret]

So, I made few tests and definitely X.org doesn't start with Realtime-Prempt patch - without it, all works just fine

[Red-guy]

For those interested in the bootsplash ....
http://www.patroclo7.org/zenwalk/bootsp ... .6.25.diff

Good luck...I am using it.

[Scoop]

Hi and thanks for updating this guide..

I am trying to build 2.6.25.4 realtime kernel with rt6 patch.
I am building 32-bit kernel on dual-core 64bit system (already got a 64bit partition with working rt kernel).
I have tried several times but cannot get any modules built. When I boot into the new kernel it boots ok but lsmod shows no modules.

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norv@sid32:~$ uname -a
Linux sid32 2.6.25.4-rt6 #1 SMP PREEMPT RT Fri Jun 13 16:45:28 EST 2008 i686 GNU/Linux
norv@sid32:~$ lsmod
Module                  Size  Used by
norv@sid32:~$ ls /lib/modules
2.6.24-1-686  2.6.25-2-686  2.6.25.4-rt6
norv@sid32:~$ ls /lib/modules/2.6.25-2-686/kernel
arch  crypto  drivers  fs  lib  net  sound
norv@sid32:~$ ls /lib/modules/2.6.25.4-rt6/kernel
drivers
norv@sid32:~$ 

I am running export CONCURRENCY_LEVEL=2 before any make commands and following the howto word by word.
Any ideas?

[mzilikazi]

When I boot into the new kernel it boots ok but lsmod shows no modules.

One way this could happen would be if you had built all of your required drivers directly into the kernel and not as modules.

Are certain pieces of hardware failing?

[Scoop]

Sound is not working with compiled rt6 kernel but is working with 2.6.25-2 kernel from sid.
But both kernels see my iPod automatically when I plug it in via USB.
lspci sees the soundcard.

What I did:
installed recent lenny businesscard iso and installed base system over net.
Changed lenny to sid in /etc/apt/sources.list
Ran aptitude update, dist-upgrade.
Installed Desktop Environment with tasksel.
Then followed your excellent howto, but used rt6 patch as that is most recent.

Possibilities:
*tasksel did not get all necessary packages, eg. basic pkgs like eog and gedit were not automatically installed by tasksel. But I am running tasksel 2.74.2
*The mirror I'm using doesn't have all packages. (I tried another mirror, no change.)
*The 'make modules' part of make-kpkg is failing.

I added stable and testing entries to sources.list and updated and upgraded but no extra (missing) packages were found.