Cross Compiling
Cross Compiling
This page shows how to cross compile for CellBE/ppc64
Gentoo
Server: Emerge distcc crossdev & env-update & source /etc/profile & crossdev -t powerpc64-unknown-linux-gnu
Client: http://www.gentoo.org/doc/en/cross-compiling-distcc.xml (Because it's much better written than anything I could do)
Debian/Debian-based
Know your host System
To be improve the building time it is a good idea to know how many cores your processor has and have that number of concurrent jobs.
To know how many cores you have available use :
grep -c '^processor' /proc/cpuinfo
This will be used later on while building the toolchain ct-ng build.#number of cores and while compiling export CONCURRENCY_LEVEL=#number of cores.
Example for a quadcore system :
ct-ng build.4 CONCURRENCY_LEVEL=4
Installing Cross Tool
Install required packages :
sudo apt-get install build-essential gawk bison flex automake libtool cvs lzma ncurses-dev texinfo patch g++ gcj mercurial git-core
Add the enviromental variable to bash :
sudo vi /etc/bash.bashrc or vi /home/user/.bashrc
Add the following lines at the end of the file :
export PATH="${PATH}:/home/user/crosstool/bin/"
export PATH="${PATH}:/home/user/x-tools/powerpc64-unknown-linux-gnu/bin/"
export CONCURRENCY_LEVEL=#number
Create directories and compile crosstool :
mkdir /home/user/crosstool mkdir /home/user/kernel mkdir -p /home/user/toolchain/powerpc hg clone http://crosstool-ng.org/hg/crosstool-ng cd crosstool-ng ./configure --prefix=/home/user/crosstool/ make && make install
- /home/user/crosstool-ng/ -> crostool-ng sources
- /home/user/crosstool/ -> Crosstool install directory with binaries
- /home/user/toolchain/ -> Directory where the binary will be installed
- /home/user/toolchain/powerpc/ -> Crosstool files generated in this tutorial for powerpc
- /home/user/toolchain/x-tools/ -> generated toolchain
- /home/user/kernel -> Place were graf_chokolo's linux kernel tarball will be saved
Patching crosstool
NOTE : MAYBE THIS PATCHING STEP IS USELESS WITH LASTEST CROSSTOOL-NG REVISION
For some reason, the compiler removes the symbolic links for lib64.
The following patch corrects this behaviour allowing the toolchain to work properly without further modifications.
Required Patch
save the following file as """important.patch""" in home/user/crosstool/lib/ct-ng-1.10.0/scripts/build
diff --git a/scripts/build/internals.sh b/scripts/build/internals.sh --- a/scripts/build/internals.sh +++ b/scripts/build/internals.sh @@ -157,8 +157,6 @@ # the standard lib/ dirs, so we can get rid of the symlinks for d in \ "${CT_PREFIX_DIR}" \ - "${CT_SYSROOT_DIR}" \ - "${CT_SYSROOT_DIR}/usr" \ "${CT_PREFIX_DIR}/${CT_TARGET}" \ ; do CT_DoExecLog ALL rm -f "${d}/lib32"
Go to that directory and apply the patch :
cd /home/user/crosstool/lib/ct-ng-yourcrosstoolversion/scripts/build patch < important.patch
Creating a cross compiler toolchain for ppc64
Download graf_chokolo's kernel :
cd /home/user/kernel git clone git://git.gitbrew.org/ps3/ps3linux/linux-2.6.git tar -zcvf linux-2.6.tar.gz linux-2.6/
Copy the sample configuration file and modify it :
cp /home/user/crosstool/lib/ct-ng-yourcrosstoolversion/samples/powerpc64-unknown-linux-gnu/* /home/user/toolchain/powerpc/ cd /home/user/toolchain/powerpc/ mv crosstool.config .config cd /home/user/toolchain/powerpc/ ct-ng menuconfig
I've added graf_chokolos kernel :
- Operating System -> Linux Kernel version -> custom tarball
- Operating System -> Path to custom tarball -> /home/user/kernel/linux-2.6.tar.gz
or
Start from scratch and configure the toolchain the way you want :
cd /home/user/toolchain/powerppc/ ct-ng menuconfig
Compile ppc64 toolchain :
unset LD_LIBRARY_PATH LIBRARY_PATH CPATH export LD_LIBRARY_PATH LIBRARY_PATH CPATH ct-ng build.#number
Wait for some time until it finishes compiling
Testing if your toolchain works properly
export PATH="${PATH}:/home/user/x-tools/powerpc64-unknown-linux-gnu/bin/" powerpc64-unknown-linux-gnuspe-gcc test.c -o test
More info: http://www.ibm.com/developerworks/linux/tutorials/l-embedded-distro/section3.html
Cross compiling openssl
Download openssl sources
wget http://www.openssl.org/source/openssl-0.9.8g.tar.gz
unpack the sources :
tar xvjf openssl-0.9.8g.tar.gz
Go to openssl source path :
cd openssl-0.9.8g/
Change the following lines in the Makefile :
INSTALLTOP=/x-tools/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sysroot/usr OPENSSLDIR=/x-tools/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sysroot/usru CC= powerpc64-unknown-linux-gnu-gcc AR=xpowerpc64-unknown-linux-gnu-ar $(ARFLAGS) r RANLIB= powerpc64-unknown-linux-gnu-ranlib
Finally :
make
Cross compiling graf_chokolo's tools
Make sure you have a working toolchain and openssl installed
Comment the current compiler and add your cross compiler in our case "powerpc64-unknown-linux-gnu-gcc" :
#CC=gcc CC=powerpc64-unknown-linux-gnu-gcc
Finally :
make
You can find graf_chokolo tools and scripts here :
http://git-hacks.com/linux-ps3
Compiling graf_chokolo's kernel and making a deb package
Go to the directory where you saved your kernel, untar it and go to the kernel source directory :
cd /home/user/kernel tar xfvz linux-2.6.tar.gz cd linux-2.6
It is a good measure to clean the source directory :
make clean make-kpkg clean
Export set ARCH=powerpc And set the right number of concurrent jobs to be done this is used to improve the building time :
export ARCH=powerpc export CONCURRENCY_LEVEL=4
Use graf_chokolo config file :
cp ps3_linux_config .config make oldconfig
You can customize your by using make menuconfig.
Now lets compile and package our kernel :
make-kpkg --arch=powerpc --cross-compile=powerpc64-unknown-linux-gnu- --rootcmd=fakeroot --initrd --append-to-version=-graf kernel_image kernel_source kernel_headers