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[[Category:OtherOS]]
=Cross Compiling=
=Cross Compiling=


This page shows how to cross compile for CellBE/ppc64
This page shows how to cross compile for cellBE/ppc


Install required packages
<pre>
sudo apt-get install build-essential gawk bison flex automake libtool cvs lzma ncurses-dev
sudo apt-get install texinfo patch g++ gcj
</pre>


== Gentoo ==
Create directories and compile crosstool
 
<pre>
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 :
 
{{keyboard|content=<syntaxhighlight lang="bash">grep -c '^processor' /proc/cpuinfo</syntaxhighlight>}}
 
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 :
 
{{keyboard|content=<syntaxhighlight lang="bash">
ct-ng build.4
CONCURRENCY_LEVEL=4
</syntaxhighlight>}}
 
 
===Installing Cross Tool===
 
Install required packages :
{{keyboard|content=<syntaxhighlight lang="bash">sudo apt-get install build-essential gawk bison flex automake libtool cvs lzma ncurses-dev texinfo patch g++ gcj mercurial git-core</syntaxhighlight>}}
 
Add the enviromental variable to bash :
{{keyboard|content=<syntaxhighlight lang="bash">sudo vi /etc/bash.bashrc</syntaxhighlight>}}
or
{{keyboard|content=<syntaxhighlight lang="bash">vi /home/user/.bashrc</syntaxhighlight>}}
 
 
Add the following lines at the end of the file :
 
{{keyboard|content=<syntaxhighlight lang="bash">
export PATH="${PATH}:/home/user/crosstool/bin/"
export PATH="${PATH}:/home/user/x-tools/powerpc64-unknown-linux-gnu/bin/"
export CONCURRENCY_LEVEL=#number
</syntaxhighlight>}}
 
 
Create directories and compile crosstool :
 
{{keyboard|content=<syntaxhighlight lang="bash">
mkdir /home/user/crosstool
mkdir /home/user/crosstool
mkdir /home/user/kernel
mkdir /home/user/kernel
mkdir -p /home/user/toolchain/powerpc
mkdir -p /home/user/toolchain/mips
hg clone http://crosstool-ng.org/hg/crosstool-ng
tar xvjf crosstool-ng-1.10.0.tar.bz2
cd crosstool-ng
cd crosstool-ng-1.10.0/
./configure --prefix=/home/user/crosstool
./configure --prefix=/home/user/crosstool/
make && make install
make && make install
</syntaxhighlight>}}
</pre>
 
* /home/user/crosstool-ng/ -> '''crosstool-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====
* /home/user/crosstool-ng-1.10.0/ -> ""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""


save the following file as """important.patch""" in home/user/crosstool/lib/ct-ng-1.10.0/scripts/build
Add enviromental variable


<pre>
<pre>
diff --git a/scripts/build/internals.sh b/scripts/build/internals.sh
sudo gedit /etc/bash.bashrc
--- 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"
</pre>
</pre>


Go to that directory and apply the patch :
Add the following line at the end of the file


{{keyboard|content=<syntaxhighlight lang="bash">
"export PATH="${PATH}:/home/user/crosstool/bin/"
cd /home/user/crosstool/lib/ct-ng-yourcrosstoolversion/scripts/build
patch < important.patch
</syntaxhighlight>}}


===Creating a cross compiler toolchain for ppc64===


Download graf_chokolo's kernel :
Download graf_chokolo's kernel


{{keyboard|content=<syntaxhighlight lang="bash">
<pre>
cd /home/user/kernel
cd /home/user/kernel
git clone git://git.gitbrew.org/ps3/ps3linux/linux-2.6.git
wget -O linux-2.6.tar.gz http://git.dukio.com/gitweb.cgi?p=linux-2.6\;a=snapshot\;h=HEAD\;sf=tgz
tar -zcvf linux-2.6.tar.gz linux-2.6/
</pre>
</syntaxhighlight>}}


Copy the sample configuration file and modify it :
Copy the configuration file and modify it


{{keyboard|content=<syntaxhighlight lang="bash">
<pre>
cp /home/user/crosstool/lib/ct-ng-yourcrosstoolversion/samples/powerpc64-unknown-linux-gnu/* /home/user/toolchain/powerpc/
cp /home/user/crosstool/lib/ct-ng-1.10.0/samples/powerpc64-unknown-linux-gnu/* /home/user/toolchain/powerppc/
cd /home/user/toolchain/powerpc/
mv crosstool.config .config
mv crosstool.config .config
cd /home/user/toolchain/powerpc/
cd /home/user/toolchain/powerppc/
ct-ng menuconfig
ct-ng menuconfig
</syntaxhighlight>}}
<pre>


I've added graf_chokolos kernel :
I added graf_chokolos kernell


*Operating System -> Linux Kernel version -> custom tarball
*Operating System -> Linux Kernel version -> custom tarball
*Operating System -> Path to custom tarball -> /home/user/kernel/linux-2.6.tar.gz
*Operating System -> Path to custom tarball -> /home/user/kernel/linux-2.6.tar.gz


'''or'''
=or=
----


Start from scratch and configure the toolchain the way you want :
Configure the toolchain the way you want  
 
<pre>
{{keyboard|content=<syntaxhighlight lang="bash">
cd /home/user/toolchain/powerppc/
cd /home/user/toolchain/powerppc/
ct-ng menuconfig
ct-ng menuconfig
</syntaxhighlight>}}
Compile ppc64 toolchain :
{{keyboard|content=<syntaxhighlight lang="bash">
unset LD_LIBRARY_PATH LIBRARY_PATH CPATH
export LD_LIBRARY_PATH LIBRARY_PATH CPATH
ct-ng build.#number
</syntaxhighlight>}}
'''Wait for some time until it finishes compiling'''
----
===Testing if your toolchain works properly===
{{keyboard|content=<syntaxhighlight lang="bash">
export PATH="${PATH}:/home/user/x-tools/powerpc64-unknown-linux-gnu/bin/"
powerpc64-unknown-linux-gnuspe-gcc test.c -o test
</syntaxhighlight>}}
More info: http://www.ibm.com/developerworks/linux/tutorials/l-embedded-distro/section3.html
===Cross compiling openssl===
Download openssl sources
{{keyboard|content=<syntaxhighlight lang="bash">wget http://www.openssl.org/source/openssl-0.9.8g.tar.gz</syntaxhighlight>}}
unpack the sources :
{{keyboard|content=<syntaxhighlight lang="bash">tar -zxvf openssl-0.9.8g.tar.gz</syntaxhighlight>}}
Go to openssl source path :
{{keyboard|content=<syntaxhighlight lang="bash">cd openssl-0.9.8g/</syntaxhighlight>}}
Change the following lines in the Makefile :
<pre>
<pre>
INSTALLTOP= /home/user/x-tools/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sysroot/usr
OPENSSLDIR= /home/user/x-tools/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sysroot/usr
CC= powerpc64-unknown-linux-gnu-gcc
AR= powerpc64-unknown-linux-gnu-ar $(ARFLAGS) r
RANLIB= powerpc64-unknown-linux-gnu-ranlib
</pre>
Finally :
{{keyboard|content=<syntaxhighlight lang="bash">make</syntaxhighlight>}}
===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" :
<pre>
#CC=gcc
CC=powerpc64-unknown-linux-gnu-gcc
</pre>
Finally :
{{keyboard|content=<syntaxhighlight lang="bash">make</syntaxhighlight>}}
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 :
{{keyboard|content=<syntaxhighlight lang="bash">
cd /home/user/kernel
tar xfvz linux-2.6.tar.gz
cd linux-2.6
</syntaxhighlight>}}
It is a good measure to clean the source directory :
{{keyboard|content=<syntaxhighlight lang="bash">
make clean
make-kpkg clean
</syntaxhighlight>}}
Export set ARCH=powerpc
And set the right number of concurrent jobs to be done this is used to improve the building time :
{{keyboard|content=<syntaxhighlight lang="bash">
export ARCH=powerpc
export CONCURRENCY_LEVEL=4
</syntaxhighlight>}}
Use graf_chokolo config file :
{{keyboard|content=<syntaxhighlight lang="bash">
cp ps3_linux_config .config
make oldconfig
</syntaxhighlight>}}
You can customize your by using make menuconfig.
Now lets compile and package our kernel :
{{keyboard|content=<syntaxhighlight lang="bash">make-kpkg --arch=powerpc --cross-compile=powerpc64-unknown-linux-gnu- --rootcmd=fakeroot --initrd --append-to-version=-graf kernel_image kernel_source kernel_headers</syntaxhighlight>}}
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