Difference between revisions of "Debian-kernel"

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= GNU/Debian Kernel setup =

== How to build the Kernel from Debian repositories ==

=== Get the sources and setup the environment ===

# Install the proper packages to build the kernel

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apt-get install ncurses-dev fakeroot kernel-package build-essential devscripts

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# Build kernel dependencies

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apt-get build-dep linux-2.6

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# Get Debian kernel sources

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apt-get source linux-2.6

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* Note that `deb-src` must be present on `/etc/apt/sources.list` file

=== Build Debian Kernel ===

# If kernel is patched, check it twice as follows

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make -f debian/rules source-all

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* First time must fail

* If building all kernel related packages, then do as follows. It takes almos 40GB on Hard drive.

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~/src/linux-2.6-2.6.24~rc6$ debuild -e DEBIAN_KERNEL_JOBS=${NR_CPUS}

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* If building an specific architecture, then

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fakeroot make -f debian/rules.gen setup_i386_none_k7

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* This will build the packages for AMD K7

* If there is any change to apply, then go the the `k7` folder and config the kernel

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debian/build/build_i386_none_k7

make menuconfig

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* Build the kernel

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fakeroot make -f debian/rules.gen binary-arch_i386_none_k7 binary-indep DEBIAN_KERNEL_JOBS=${NR_CPUS}

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=== Install Debian Kernel ===

Kernel packages will be created in `/usr/src` folder. Install them as any other ''deb'' package

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dpkg -i linux*.deb

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== How to build Real-Time Vanilla Kernel for Debian ==

=== Get sources and setup environment ===

# Create `vanilla` folder in `/usr/src` and change directory to such location

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mkdir -p /usr/src/vanilla

cd !$

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# Download the latest rt patch

http://www.kernel.org/pub/linux/kernel/projects/rt/

# Download the matched kernel for the proper patch downloaded in previous step

http://www.kernel.org/pub/linux/kernel/v2.6/

# Decompress both, the linux kernel sources and the patch

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tar jxvf *.bz2

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# Patch the kernel

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cd linux-2.6.AA.BB

patch -p1 <../patch-2.6.AA.BB-rtNN

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# Create a link `linux` which points to the linux kernel sources

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ln -s /usr/src/vanilla/linux-2.6.AA.BB /usr/src/linux

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=== Build RT Kernel ===

# Go to the linux source folder

# Configure the kernel, if necessary `make menuconfig`

#* Backup the old config file

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cd /usr/src/linux

cp .config config.yy-mm-dd

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* When finish save your changes

* Build the bzImage

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cd /usr/src/linux

make

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=== Install RT Kernel ===

* If only modules are needed, then use `make modules`

* Install the modules

<pre><nowiki>

make modules_install

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# Install the kernel, usually locate on `arch/MY_ARCH/boot` in kernel sources

<pre><nowiki>

cp arch/MY_ARCH/boot/bzImage /boot/vmlinuz-2.6.AA.BB-rtNN

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# Create initial root filesystem

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cd /usr/src/linux

update-inintramfs -c -k 2.6.AA-BB-rtNN

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# Add the proper entry to grub in `/boot/grub/menu.lst`

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title RT kernel 2.6.AA.BB-rtNN

root (hd0,0)

kernel /boot/vmlinuz-2.6.AA.BB-rtNN root=/dev/hda1 ro

initrd /boot/initrd.img-2.6.AA.BB-rtNN

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* '''TIP:''' if `default` parameter is set to `0` at the beginning of the `menu.lst` file, then try to put this entry at the top of the entries list.