Difference between revisions of "Rpi kernel compilation"

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= Raspberry PI kernel compilation =
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#REDIRECT [[RPi 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
 
 
 
 
 
 
 
{{Template:Raspberry Pi}}
 
[[Category: RaspberryPi]]
 

Latest revision as of 13:28, 28 January 2012