Linux Distribution for LOADLIN

#!/bin/bash
set -e

TARGET="i386-linux-uclibc"
PREFIX="${HOME}/opt/gcc-${TARGET}/"
SYSROOT="${PREFIX}/${TARGET}/sysroot"

GCC_SRC="gcc-3.4.6.tar.bz2"
BINUTILS_SRC="binutils-2.32.tar.xz"
UCLIBC_SRC="uClibc-0.9.33.2.tar.xz"
LINUX_SRC="linux-2.4.37.11.tar.xz"
BUSYBOX_SRC="busybox-1.19.4.tar.bz2"

export PATH="${PREFIX}bin:$PATH"

# Prepare Prefix and System Root
if [ -d "$SYSROOT" ]; then
  echo "Old system root directory detected, please remove it."
  exit 1
else
  mkdir -p "$SYSROOT/usr"
fi

# Prepare Build Directories:
if [ -d build ]; then
  echo "Old build directory detected, please remove it."
  exit 1
else
  mkdir -p build/binutils
  mkdir -p build/gcc-stage1
  mkdir -p build/gcc-stage2
  mkdir -p build/uclibc
  mkdir -p build/linux
  mkdir -p build/busybox
fi

# Unpack Sources:
if [ -d source ]; then
  cd source
  tar -xvjf "$GCC_SRC"
  tar -xvJf "$BINUTILS_SRC"
  tar -xvJf "$UCLIBC_SRC" -C ../build/uclibc
  tar -xvJf "$LINUX_SRC" -C ../build/linux
  tar -xvjf "$BUSYBOX_SRC" -C ../build/busybox
  cd -
else
  echo "No source directory, please download sources."
  exit 1
fi

# Patch gcc-3.4.6:
cd "source/gcc-3.4.6/gcc/config/i386/"
if ! fgrep --silent "inhibit_libc" linux.h; then
  patch -p 0 < ../../../../../gcc-3.4.6-linux.h.patch
fi
cd -

# Patch linux-2.4.37.11:
cd "build/linux/linux-2.4.37.11/include/linux/"
if ! fgrep --silent "<linux/types.h>" filter.h; then
  patch -p 0 < ../../../../../linux-2.4.37.11-filter.h.patch
fi
cd -

# Install Linux 2.4 Headers:
cd build/linux/linux-*
make ARCH=i386 mrproper
make ARCH=i386 include/linux/version.h
make ARCH=i386 symlinks
mkdir -p "$SYSROOT/usr/include/asm"
cp -v -R -H include/asm "$SYSROOT/usr/include"
cp -v -R include/asm-generic "$SYSROOT/usr/include"
cp -v -R include/linux "$SYSROOT/usr/include"
touch "${SYSROOT}/usr/include/linux/autoconf.h"
cd -

# Build binutils:
cd build/binutils
../../source/binutils-*/configure --target="$TARGET" --prefix="$PREFIX" --with-sysroot="$SYSROOT" --disable-werror --enable-languages=c,c++ --enable-shared --without-newlib --disable-libgomp --enable-fast-install=N/A
make all-{binutils,gas,ld}
make install-{binutils,ld,gas}
cd -

# Build Stage 1 GCC3:
cd build/gcc-stage1
../../source/gcc-3*/configure --target="$TARGET" --prefix="$PREFIX" --with-sysroot="$SYSROOT" --with-cpu=i386 --disable-fast-install --disable-werror --disable-multilib --enable-languages=c --without-headers --disable-shared --disable-libssp --disable-libmudflap --with-newlib --disable-c99 --disable-libgomp --disable-threads
make all-gcc
make install-gcc
cd -

# Install uClibc Headers:
cd build/uclibc/uClibc-*
cp -v ../../../config-uclibc .config
sed -i -e "s%KERNEL_HEADERS=.*%KERNEL_HEADERS=\"$SYSROOT/usr/include/\"%" .config
make ARCH=i386 PREFIX="$SYSROOT" install_headers
cd -

# Build uClibc:
cd build/uclibc/uClibc-*
make ARCH=i386 PREFIX="$SYSROOT"
make ARCH=i386 PREFIX="$SYSROOT" install
cd -

# Build Stage 2 GCC3:
cd build/gcc-stage2
../../source/gcc-3*/configure --target="$TARGET" --prefix="$PREFIX" --with-sysroot="$SYSROOT" --with-cpu=i386 --enable-fast-install=N/A --disable-werror --enable-languages=c,c++ --disable-shared --without-newlib --disable-libgomp --disable-threads
make all-gcc
make install-gcc
cd -

# Build Linux 2.4:
cd build/linux/linux-*
cp -v ../../../config-linux .config
make ARCH=i386 CROSS_COMPILE=i386-linux-uclibc- oldconfig
make ARCH=i386 CROSS_COMPILE=i386-linux-uclibc- dep
make ARCH=i386 CROSS_COMPILE=i386-linux-uclibc- bzImage
cd -

# Build Busybox:
cd build/busybox/busybox-*
cp -v ../../../config-busybox .config
make CROSS_COMPILE=i386-linux-uclibc-
cd -
          

#!/bin/bash
set -e

ROOTFS="`pwd`/rootfs/"

TARGET="i386-linux-uclibc"
PREFIX="${HOME}/opt/gcc-${TARGET}/"
SYSROOT="${PREFIX}/${TARGET}/sysroot"

export PATH="${PREFIX}bin:$PATH"

if [ -d "$ROOTFS" ]; then
  echo "Old root FS directory detected, please remove it."
  exit 1
fi
mkdir -p "$ROOTFS"

# Install Busybox:
cd build/busybox/busybox-*
make CROSS_COMPILE=i386-linux-uclibc- CONFIG_PREFIX="$ROOTFS" install
cd -

# Create some essential directories
cd "$ROOTFS"
mkdir etc
mkdir etc/init.d
mkdir lib
mkdir proc
mkdir sys
mkdir tmp
mkdir root
mkdir dev
mkdir dev/pts
cd -

# Initial rc.S:
cat > rcS <<EOF
#!/bin/sh
mount -t proc /proc /proc
mount -t devpts /dev/pts /dev/pts
mount -t tmpfs /tmp /tmp
loadkmap < /etc/no-latin1.bmap
hostname busybox
EOF
mv -v rcS "$ROOTFS/etc/init.d/"

# Initial inittab:
cat > inittab <<EOF
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
::restart:/sbin/init
EOF
mv -v inittab "$ROOTFS/etc/"

# Copy this system's keymap:
loadkeys -b /usr/share/kbd/keymaps/i386/qwerty/no-latin1.map.gz > "$ROOTFS/etc/no-latin1.bmap"

# Make everything root user:
sudo chown -R root:root "$ROOTFS"

# Create some critical devices:
sudo mknod "$ROOTFS/dev/tty" c 5 0
sudo mknod "$ROOTFS/dev/console" c 5 1
sudo mknod -m 0666 "$ROOTFS/dev/null" c 1 3

# Create some useful devices:
sudo mknod "$ROOTFS/dev/rtc" c 10 135
sudo mknod "$ROOTFS/dev/tty0" c 4 0
sudo mknod "$ROOTFS/dev/tty1" c 4 1
sudo mknod "$ROOTFS/dev/tty2" c 4 2
sudo mknod "$ROOTFS/dev/tty3" c 4 3
sudo mknod "$ROOTFS/dev/ttyS0" c 4 64
sudo mknod "$ROOTFS/dev/ttyS1" c 4 65
sudo mknod "$ROOTFS/dev/fd0" b 2 0
sudo mknod "$ROOTFS/dev/fd1" b 2 1
sudo mknod "$ROOTFS/dev/root" b 4 0
sudo mknod "$ROOTFS/dev/lp0" c 6 0

# SetUID on busybox binary:
sudo chmod +s "$ROOTFS/bin/busybox"

# Make rcS executable:
sudo chmod +x "$ROOTFS/etc/init.d/rcS"

# Make Compressed ROM archive:
mkfs.cramfs rootfs rootfs.cramfs
          

qemu-system-i386 -kernel bzImage -initrd rootfs.cramfs