Missing initrd when building a kernel-rt

[Ralf]

Hi all :)

building a kernel-rt failed. This are the steps I did:

### Downloading the kernel sources
spinymouse at ubuntu:/usr/src$ wget
ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.33.7.tar.bz2
http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.33.7-rt29.bz2

### Extracting the sources and patching the kernel
spinymouse at ubuntu:/usr/src$ tar xvjf linux-2.6.33.7.tar.bz2
spinymouse at ubuntu:/usr/src$ rm linux-2.6.33.7.tar.bz2
spinymouse at ubuntu:/usr/src$ mv linux-2.6.33.7 linux-2.6.33.7-rt29
spinymouse at ubuntu:/usr/src$ ln -s linux-2.6.33.7-rt29 linux
spinymouse at ubuntu:/usr/src$ cd linux
spinymouse at ubuntu:/usr/src/linux$ mv ../patch-2.6.33.7-rt29.bz2 ../linux
spinymouse at ubuntu:/usr/src/linux$ bunzip2 patch-2.6.33.7-rt29.bz2
spinymouse at ubuntu:/usr/src/linux$ patch -p1 < patch-2.6.33.7-rt29
spinymouse at ubuntu:/usr/src/linux$ rm patch-2.6.33.7-rt29

### Editing a configuration
spinymouse at ubuntu:/usr/src/linux$ uname -r
2.6.32-25-preempt
spinymouse at ubuntu:/usr/src/linux$ cp /boot/config-$(uname -r) .config
spinymouse at ubuntu:/usr/src/linux$ make oldconfig
Pushing enter only.

### Disable staging
spinymouse at ubuntu:/usr/src/linux$ gedit .config
Editing
CONFIG_STAGING=y
to
# CONFIG_STAGING is not set

spinymouse at ubuntu:/usr/src/linux$ make oldconfig
Nothing to do.

### Tidying up
spinymouse at ubuntu:/usr/src/linux$ make-kpkg clean

### Building the kernel
spinymouse at ubuntu:/usr/src/linux$ export CONCURRENCY_LEVEL=2
spinymouse at ubuntu:/usr/src/linux$ make-kpkg --rootcmd fakeroot --initrd
kernel-image kernel-headers kernel-source 

### First trial failed because of two kinds of errors I got several
times
tar: [...]: Cannot open: No such file or directory
tar: vmlinux: Cannot write: No space left on device

### Creating space
spinymouse at ubuntu:/usr/src/linux$ sudo -i
root at ubuntu:~# synaptic
Completely removed the following packages:
linux-headers-2.6.32-23
linux-headers-2.6.32-23-preempt
linux-image-2.6.31-10-rt
linux-image-2.6.31-11-rt
linux-image-2.6.32-23-preempt
linux-image-2.6.32-24-preempt
linux-image-2.6.33-23-realtime
linux-image-2.6.33-29-realtime
linux-image-2.6.33.5-rt23
linux-image-rt
root at ubuntu:~# rm -r /usr/src/linux-2.6.33.5-rt23
root at ubuntu:~#
rm /usr/src/linux-headers-2.6.33.5-rt23_2.6.33.5-rt23-10.00.Custom_amd64.deb
root at ubuntu:~#
rm /usr/src/linux-headers-2.6.33.7-rt29_2.6.33.7-rt29-10.00.Custom_amd64.deb
root at ubuntu:~#
rm /usr/src/linux-image-2.6.33.5-rt23_2.6.33.5-rt23-10.00.Custom_amd64.deb
root at ubuntu:~#
rm /usr/src/linux-image-2.6.33.7-rt29_2.6.33.7-rt29-10.00.Custom_amd64.deb
root at ubuntu:~#
rm /usr/src/linux-source-2.6.33.5-rt23_2.6.33.5-rt23-10.00.Custom_all.deb
root at ubuntu:~# rm /boot/grub/grub.cfg_Oct*
root at ubuntu:~# gparted
There now should be enough free space.
root at ubuntu:~# logout

### Checking if everything still is ok
spinymouse at ubuntu:/usr/src/linux$ make oldconfig
spinymouse at ubuntu:/usr/src/linux$ echo $CONCURRENCY_LEVEL
Everything is ok.

### Tidying up
spinymouse at ubuntu:/usr/src/linux$ make-kpkg clean

### Building the kernel
spinymouse at ubuntu:/usr/src/linux$ make-kpkg --rootcmd fakeroot --initrd
kernel-image kernel-headers kernel-source
:)

Didn't run 'make-kpkg clean', if something should be needed for
debugging.

### Installing the image
spinymouse at ubuntu:/usr/src/linux$ cd ..
spinymouse at ubuntu:/usr/src$ sudo dpkg -i
linux-image-2.6.33.7-rt29_2.6.33.7-rt29-10.00.Custom_amd64.deb
spinymouse at ubuntu:/usr/src$ sudo gedit /boot/grub/grub.cfg

### I didn't try to boot he kernel ...
because there's no initrd.

spinymouse at ubuntu:/usr/src$ ls /boot -hAl
total 21M
-rw-r--r-- 1 root root 632K 2010-09-18 02:35 abi-2.6.32-25-preempt
-rw-r--r-- 1 root root 109K 2010-09-18 02:35 config-2.6.32-25-preempt
-rw-r--r-- 1 root root 108K 2010-10-03 04:53 config-2.6.33.7-rt29
drwxr-xr-x 3 root root  12K 2010-10-03 07:31 grub
-rw-r--r-- 1 root root 8.0M 2010-10-02 12:22
initrd.img-2.6.32-25-preempt
-rw-r--r-- 1 root root 157K 2010-03-23 10:40 memtest86+.bin
-rw-r--r-- 1 root root 2.1M 2010-09-18 02:35
System.map-2.6.32-25-preempt
-rw-r--r-- 1 root root 2.1M 2010-10-03 05:57 System.map-2.6.33.7-rt29
-rw-r--r-- 1 root root 1.4K 2010-09-18 02:38
vmcoreinfo-2.6.32-25-preempt
-rw-r--r-- 1 root root 4.0M 2010-09-18 02:35 vmlinuz-2.6.32-25-preempt
-rw-r--r-- 1 root root 4.0M 2010-10-03 05:57 vmlinuz-2.6.33.7-rt29

What could be the reason that I don't get an initrd?

Cheers!

Ralf
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