Rebuilding OLPC kernel: Difference between revisions
Jump to navigation
Jump to search
(FIELD_OTHER) |
DanielDrake (talk | contribs) (Redirected page to Kernel) |
||
| (7 intermediate revisions by 4 users not shown) | |||
| Line 1: | Line 1: | ||
#REDIRECT [[Kernel]] |
|||
{{OLPC}} |
|||
[[Category:Developers]] |
|||
[[Category:Software]] |
|||
{{Merge | Kernel}} |
|||
This document describes building an OLPC kernel from the olpc-2.6 git repository or SRPM. You will want to do this on a Fedora Core 6 machine. These instructions do not work for FC8, but reportedly work on FC7. |
|||
== The OLPC kernel sources == |
|||
The first step involves grabbing the kernel sources; either do a 'git clone' of the kernel git repository, or install the kernel SRPM. Both steps are described on the [[Kernel]] page. |
|||
Installing the SRPM will place the sources in /usr/src/redhat/SOURCES/olpc-2.6.tar.bz2 |
|||
FIELD_MESSAGE_dardomro |
|||
== Building the RPM (from scratch) == |
|||
This is the way that the official kernel RPMs are built. Note that this allows you to build within a subdirectory somewhere (rather than using /usr/src/redhat). |
|||
First, grab the kernel sources: |
|||
git clone --quiet git://dev.laptop.org/olpc-2.6 linux-2.6.22 |
|||
Note that the name of the directory these sources are cloned into is important. It must start with <tt>linux.2.6.</tt>, followed by two numbers identifying the sublevel. These must match the sublevel defined in <tt>olpc-2.6/Makefile</tt>. |
|||
Optionally check out a particular branch using: |
|||
git checkout origin/stable |
|||
Now construct the build directory structure: |
|||
BASE=`pwd`/build; CUR=0 |
|||
git clone --quiet git://dev.laptop.org/users/dilinger/olpc-2.6-rpm $BASE |
|||
(cd $BASE && mkdir -p BUILD RPMS SOURCES SPECS SRPMS) |
|||
tar -jc --exclude=.git -f $BASE/SOURCES/olpc-2.6.tar.bz2 linux-2.6.22 |
|||
You need to build a config file for the kernel. This is done in the source directory checked out using git: |
|||
make ARCH=i386 -C linux-2.6.22 olpc_defconfig |
|||
cp linux-2.6.22/.config $BASE/SOURCES/kernel-olpc-custom.config |
|||
If building for a school server, make <tt>xs_defconfig</tt> instead: |
|||
make ARCH=i386 -C linux-2.6.22 xs_defconfig |
|||
cp linux-2.6.22/.config $BASE/SOURCES/kernel-olpc-custom.config |
|||
Now you can actually build the kernel and package it into an RPM: |
|||
rpmbuild -ba --define "dist 1.olpc" --define "olpc 1" --define "head `echo $CUR|cut -b1-15`" --target=i586 --define "_topdir $BASE" $BASE/SPECS/olpc-2.6.spec |
|||
The git://dev.laptop.org/users/dilinger/olpc-2.6-rpm repository contains the RPM SPEC file and other things necessary to bootstrap the RPM. When complete, the RPMs will be in build/RPMS/i586/. |
|||
===Upgrading your kernel build=== |
|||
You will first need to pull down the newest kernel sources, and tar them up: |
|||
BASE=`pwd`/build; CUR=0 |
|||
pushd linux-2.6.22; git pull ; popd |
|||
tar -jc --exclude=.git -f $BASE/SOURCES/olpc-2.6.tar.bz2 linux-2.6.22 |
|||
You need to build a new config file for the kernel. This is done in the source directory checked out using git: |
|||
make ARCH=i386 -C linux-2.6.22 olpc_defconfig |
|||
cp linux-2.6.22/.config $BASE/SOURCES/kernel-olpc-custom.config |
|||
Don't forget to delete the directory from a previous build! |
|||
rm -r $BASE/BUILD/* |
|||
Now you can actually build the kernel and package it into an RPM: |
|||
rpmbuild -ba --define "dist 1.olpc" --define "olpc 1" --define "head `echo $CUR|cut -b1-15`" --target=i586 --define "_topdir $BASE" $BASE/SPECS/olpc-2.6.spec |
|||
==Fedora 8 (FC8) Notes== |
|||
On May 1, 2008, Chris Ball [http://lists.laptop.org/pipermail/devel/2008-May/013539.html mentioned] that FC6 is still being used on the build server. He had also built an FC8 core by making these two changes: |
|||
*GNU tar no longer allows you to (e.g.) "tar xf foo.tar '*.h'" without |
|||
adding a --wildcards before the pattern. In the specfile, change: |
|||
'linux-2.6.[0-9][0-9]/Makefile' |
|||
to |
|||
--wildcards 'linux-2.6.[0-9][0-9]/Makefile' |
|||
* The debuginfo packaging failed. Adding: |
|||
%define _enable_debug_packages 0 |
|||
to the top of the specfile disables that part of the build, and |
|||
produced a working kernel package. |
|||
[[Category:Software development]] |
|||
[[Category:Developers]] |
|||
[[Category:OS]] |
|||
[[Category:Build system]] |
|||
Latest revision as of 14:52, 21 February 2011
Redirect to: