Difference between revisions of "Rpi kernel compilation"
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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. | 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 | + | sudo ln -s /usr/bin/arm-linux-gnueabi-gcc-4.6 /usr/bin/arm-linux-gnueabi-gcc |
− | this | + | this creates a symbolic link to the 4.6 gcc binary |
=== Gentoo Linux === | === Gentoo Linux === |
Revision as of 00:27, 25 January 2012
Contents
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