Linux2.6.22 porting based on 3c2410 (2)

(5)      Start compiling. The compilation process mainly consists of 6 steps;
a.       Generation of kernel header files
b.       Generation of Binary utilties
c.       Generation of Glibc header files
d.       Generation of first-stage gcc
e.       Generation of glibc library files
f.  Generation       of complete compilation tools
 Note: The first-stage gcc generation is mainly used to generate glibc library files.
1. Generate kernel header files
$root@host:/home/arm/kernel# tar xvjf linux-2.6.22.tar.bz2
$root@host:/home/arm/kernel# cd linux-2.6.22
$root@host:/home/arm/kernel/linux-2.6.22#
make ARCH=arm CROSS_COMPILE=arm-linux- menuconfig
Among them, menuconfig specifies the configuration interface. Other available options include config (full character interface) and xconfig (graphical interface under xwindow). Ubuntu needs to install tk8.4 to support xconfig. In addition, you need to uninstall mawk and install gawk. (mawk has a bug)
The linux2.6 kernel provides support for s3c2410. Select the s3c2410 series in system. After configuration, exit and save.
$root@host:/home/arm/kernel/linux-2.6.22# cd include
$root@host:/home/arm/kernel/linux-2.6.22/include# cd linux
$root@host:/home/arm/kernel/linux-2.6.22/include/linux# ls version.h autoconf.h
version.h autoconf.h
These two files will be used in the following compilation. If not, exit to the internal directory and make version.h.
Create the following link:
$root@host:/home/arm/kernel/linux-2.6.22/include# ln –s asm-arm asm
$root@host:/home/arm/kernel/linux-2.6.22/include# ln -s asm/arch-s3c2410 asm/arch
Copy the kernel header file to the final installation directory:
$root@host:/home/arm/kernel/linux-2.6.22/include# mkdir –p ${TARGET_PREFIX}/include
$root@host:/home/arm/kernel/linux-2.6.22/include#
cp –r asm- ${TARGET_PREFIX}/include
$root@host:/home/arm/kernel/linux-2.6.22/include#
cp –r linux ${TARGET_PREFIX}/include $root@host:/home/arm/kernel/linux-2.6.22/include# cp –d asm ${TARGET_PREFIX}/includeThus
 
the kernel header files are created.
2. Create Binary utilities:
binutils is a collection of binary tools, among which as, ar and ld are commonly used.
$root@host:/home/arm/kernel/include# cd ${PRJROOT}/build-tools
$root@host:/home/arm/build-tools# tar xvjf binutils-2.18.tar.bz2
$root@host:/home/arm/build-tools# cd build-binutils
$root@host:/home/arm/build-tools/build-binutils#
patch –Np1 –i /
home/arm/build-tools /patch/binutils-2.18* $root@host:/home/arm/build-tools/build-binutils#
../binutils-2.18/configure --target=${TARGET} –prefix=${PREFIX}
$root@host:/home/arm/build-tools/build-binutils# make
$root@host:/home/arm/build-tools/build-binutils# make install 1. At the same
time, some files starting with arm-linux should be generated under ${PREFIX}/bin.
$root@host:/home/arm/build-tools/build-binutils# ls ${PREFIX}/bin .
3. Generate glibc header files:
$root@host:/home/arm/build-tools/build-binutils# cd ..
$root@host:/home/arm/build-tools/# tar xvjf glibc-2.6.1.tar.bz2
$root@host:/home/arm/build-tools/#
tar xvzf glibc-2.6.1.tar.gz --directory ./glibc-2.6.1/
$root@host:/home/arm/build-tools/# cd glibc-2.6.1
$root@host:/home/arm/build-tools/glibc-2.6.1# mv glibc-ports-2.6.1 ports –vApply
the patch:
$root@host:/home/arm/build-tools/glibc-2.6.1#
patch –Np1 –i /home/arm/build-tools/patch/glibc-2.6.1-*patch
$root@host:/home/arm/build-tools/glibc-2.6.1# cd ..
$root@host:/home/arm/build-tools/# cd build-glibc-headersHere
you need to add support for the NPTL thread library:
$root@host:/home/arm/build-tools/build-glibc-headers# 
echo “libc_cv_forced_unwind=yes”>>config.cache
echo “libc_cv_c_cleanup=yes”>>config.cache
echo “libc_cv_arm_tls=yes”>>config.cacheNote
: If “cannot compute long double size” appears during compilation, add:
echo "ac_cv_sizeof_long_double=12">>config.cache
$root@host:/home/arm/build-tools/build-glibc-headers#
../glibc-2.6.1/configure --host=${TARGET} --prefix=”/usr” --enable-add-ons
--with-headers=${TARGET_PREFIX}/include --cache-file=config.cache
$root@host:/ home/arm/build-tools/build-glibc-headers#
make cross-compiling=yes install_root=${TARGET_PREFIX} prefix=””
install-headers
$root@host:/home/arm/build-tools/build-glibc-headers#
mkdir –p ${TARGET_PREFIX}/include/gnu
$root@host:/home/arm/build-tools/build-glibc-headers#
touch ${TARGET_PREFIX}/include/gnu/stubs.h
Note: If an error occurs during compilation that the header file cannot be found, you can use the touch command to create an empty file in the corresponding directory according to the file name in the error prompt. Generally, the compilation can be successful.