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| -rw-r--r-- | bootstrap-system-build-procedure.txt | 111 |
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diff --git a/bootstrap-system-build-procedure.txt b/bootstrap-system-build-procedure.txt new file mode 100644 index 0000000..89a01f8 --- /dev/null +++ b/bootstrap-system-build-procedure.txt @@ -0,0 +1,111 @@ +ABOUT THIS GUIDE +================ + +This is a guide to building a custom BusyBox/Linux-libre system with the GNU +toolchain. It mostly follows Linux From Scratch version 7.0, except that it +uses more recent versions of some software packages, avoids applying patches +where possible, builds cross-compiling GCC and other toolchain components in a +"sysroot" configuration, and uses a BusyBox-based userspace rather than a +GNU-based one. This guide assumes the use of a GNU/Linux host system with all +the necessary development software (GCC, GNU Binutils, Subversion, etc.) already +installed. + +It is recommended that you read Linux From Scratch version 7.0 to understand the +full build process and the rationale behind various elements of the setup. + + +PROCEDURE +========= + +Make a directory in which all work will be done. Under this directory, make +directories 'src' and sys'. + +Download all of the necessary source archives and branches. + src$ wget http://www.busybox.net/downloads/busybox-1.19.3.tar.bz2 + src$ wget http://www.fsfla.org/svnwiki/selibre/linux-libre/download/releases/\ + > LATEST-3.1.N/linux-3.1.6-libre.tar.bz2 + src$ svn co svn://svn.eglibc.org/branches/eglibc-2_14 eglibc-2.14 + src$ wget http://ftp.gnu.org/gnu/gcc/gcc-4.6.2/gcc-4.6.2.tar.bz2 + src$ wget http://ftp.gnu.org/gnu/binutils/binutils-2.22.tar.bz2 + src$ wget http://ftp.gnu.org/gnu/make/make-3.82.tar.bz2 + src$ wget http://ftp.gnu.org/gnu/automake/automake-1.11.2.tar.bz2 + src$ wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.68.tar.bz2 + src$ wget http://ftp.gnu.org/gnu/m4/m4-1.4.16.tar.bz2 + src$ wget ftp://ftp.gmplib.org/pub/gmp-5.0.2/gmp-5.0.2.tar.bz2 + src$ wget http://www.mpfr.org/mpfr-current/mpfr-3.1.0.tar.bz2 + src$ wget http://www.multiprecision.org/mpc/download/mpc-0.9.tar.gz + src$ for file in *.tar.bz2; do tar -xjf ${file}; done + src$ for file in *.tar.gz; do tar -xzf ${file}; done + +Make and mount the filesystem. + sys$ dd if=/dev/zero of=fs bs=1024 count=$((3*1024*1024)) + sys$ sudo mkfs -t ext4 fs + sys$ mkdir fsmnt + sys$ sudo mount -o loop fs fsmnt + +Set up the toolchain environment. Be sure to change '<BASE_DIR>' to the +absolute path to the base work directory you made earlier. We're using GNU Bash +as the new user's default shell for convenience; this has no effect on the +target system. + sys$ sudo mkdir -v fsmnt/tools fsmnt/tools/usr fsmnt/src + sys$ sudo ln -sv "${PWD}/fsmnt/tools" /tools + sys$ sudo cp -pR ../src/*/ fsmnt/src/ + sys$ sudo groupadd bbll + sys$ sudo useradd -s /bin/bash -g bbll -m -k /dev/null bbll + sys$ sudo passwd bbll + sys$ sudo chown -R bbll:bbll fsmnt/tools fsmnt/src + sys$ su - bbll + $ cat > ~/.bash_profile <<EOF + > exec env -i HOME="${HOME}" TERM="${TERM}" PS1='\u:\w$ ' /bin/bash + > EOF + $ cat > ~/.bashrc <<EOF + > set +h + > umask 022 + > BBLL=<BASE_DIR>/sys/fsmnt + > LC_ALL=C + > BBLL_TARGET=$(uname -m)-bbll-linux-gnu + > PATH=/tools/bin:/tools/usr/bin:/bin:/usr/bin + > export BBLL LC_ALL BBLL_TARGET PATH + > EOF + $ source ~/.bash_profile + +Configure and build a cross-compiling GNU Binutils. + $ cd "${BBLL}/src" + $ mkdir binutils-build + $ cd binutils-build + $ ../binutils-2.22/configure --target=${BBLL_TARGET} --prefix=/tools/usr \ + > --disable-nls --disable-werror + $ make -j 4 + $ case $(uname -m) in + > x86_64) + > mkdir -v /tools/lib + > ln -sv lib /tools/usr/lib64 + > ;; + > esac + $ make install + +Configure and build a cross-compiling GCC. + $ cd .. + $ mv gmp-5.0.2/ gcc-4.6.2/gmp + $ mv mpfr-3.1.0/ gcc-4.6.2/mpfr + $ mv mpc-0.9/ gcc-4.6.2/mpc + $ mkdir gcc-build + $ cd gcc-build + $ ../gcc-4.6.2/configure --target=${BBLL_TARGET} --prefix=/tools/usr \ + > --disable-nls --disable-shared --disable-multilib --disable-decimal-float \ + > --disable-threads --disable-libmudflap --disable-libssp --disable-libgomp \ + > --disable-libquadmath --enable-languages=c --without-ppl --without-cloog \ + > --with-mpfr-include=$(pwd)/../gcc-4.6.2/mpfr/src \ + > --with-mpfr-lib=$(pwd)/mpfr/src/.libs + $ make -j 4 + $ make install + $ ln -sv libgcc.a $(${BBLL_TARGET}-gcc -print-libgcc-file-name | sed 's/libgcc/&_eh/') + +Install Linux's headers for use by EGLIBC. + $ cd ../linux-3.1.6 + $ make mrproper + $ make headers_check + $ make INSTALL_HDR_PATH=/tools/usr headers_install + +Configure and build a cross-compiling EGLIBC. + ... |