Difference between revisions of "Rpi kernel compilation"

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[[Category: RaspberryPi]]
 
[[Category: RaspberryPi]]

Revision as of 09:26, 28 January 2012

Raspberry PI kernel compilation

You can compile the kernel on the board itself, but because of the limited resources it will take a lot of time. Alternatively you can crosscompile the kernel on another machine running Linux, Windows or OS X.

Compiling on the Raspberry pi itself

TODO: write the rest of this section.

Cross compiling on a foreign machine

Ubuntu Linux

getting the compiler

On Ubuntu Oneiric getting the arm cross compiler can be as easy as:

sudo apt-get install gcc-4.6-arm-linux-gnueabi

(TODO: Is this the right one? More packages required? I did this a while ago! TODO: Other distributions?)

getting the sources

create a directory where you can work on the raspberry pi software. I called mine "raspberrypi". Then clone the git repository.

mkdir raspberrypi
cd raspberrypi 
git clone https://github.com/raspberrypi/linux.git
cd linux

compiling

Next you have to configure the kernel:

cp arch/arm/configs/bcmrpi_cutdown_defconfig .config
make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- oldconfig

Then building the kernel:

make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- -k

You can use the "-j" flag to improve compilation time. If you have a dual core machine you can use "-j 3", for a quad core machine you can use "-j 6", and so on.

If you get the error messages that arm-linux-gnueabi-gcc cannot be found when running make, run the following command:

sudo ln -s /usr/bin/arm-linux-gnueabi-gcc-4.6 /usr/bin/arm-linux-gnueabi-gcc

this creates a symbolic link to the 4.6 gcc binary

Gentoo Linux

getting the compiler

Build the cross toolchain:

crossdev -v -t arm-unknown-linux-gnueabi

This command will most certainly fail on your machine. What you have to do to make it work, is to adjust the cross tools versions with the "--b", "--g", "--k" and "--l" flags. For the exact usage refer to the crossdev manpage. A good starting point for figuring out the right versions are those which are stable for the arm architecture.

getting the sources

create a directory where you can work on the raspberry pi software. I called mine "raspberrypi". Then clone the git repository.

mkdir raspberrypi
cd raspberrypi 
git clone https://github.com/raspberrypi/linux.git
cd linux

compiling

Next you have to configure the kernel:

cp arch/arm/configs/bcmrpi_cutdown_defconfig .config
make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- oldconfig

Then building the kernel:

make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- -k

You can use the "-j" flag to improve compilation time. If you have a dual core machine you can use "-j 3", for a quad core machine you can use "-j 6", and so on.

Windows

TODO

OS X

TODO