Difference between revisions of "Raspberry Pi Kernel Compilation"

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#REDIRECT [[Rpi kernel compilation]]
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= Raspberry PI kernel compilation =
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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==
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 +
=== Ubuntu Linux ===
 +
 
 +
==== getting the compiler ====
 +
 
 +
On Ubuntu Oneiric getting the arm cross compiler can be as easy as:
 +
 
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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
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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
 +
 
 +
 
 +
 
 +
{{Template:Raspberry Pi}}
 +
[[Category: RaspberryPi]]

Revision as of 13:28, 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