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Building buildroot-20071126.tar.bz2
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1. Untar buildroot package
$cd /opt
$sudo tar -jxvf buildroot-20071126.tar.bz2 -C ./
$cd /opt/buildroot

2. Modify configure files
1)inittab
$cd /opt/buildroot/target/generic/target_skeleton/etc/ //this inittab using udev
$modify initab and uncomment ttyS0 as following:
# Put a getty on the serial port
ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100

$cd /opt/buildroot/target/generic/target_skeleton/etc/init.d
$Add "/bin/sh" to rcS script at the end of file as following:
......
#add /bin/sh start
echo "QT2410 shell"
/bin/sh
#add /bin/sh end

$cd /opt/buildroot/target/generic/target_busybox_skeleton/etc //this inittab using mdev buildin busybox
$modify inittab and uncomment ttySo as following:
# Put a getty on the serial port
ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100

$cd /opt/buildroot/target/generic/target_busybox_skeleton/etc/init.d
$Add "/bin/sh" to rcS script at the end of file as following:
......
#add /bin/sh start
echo "QT2410 shell"
/bin/sh
#add /bin/sh end

3. Make menuconfig & make
$cd /opt/buildroot
$sudo make menuconfig (according to package versions as following list)
binutils-2.18.tar.bz2
busybox-1.7.2.tar.bz2
cramfs-1.1.tar.gz
fakeroot_1.8.2.tar.gz
gcc-4.2.1.tar.bz2
genext2fs-1.4.tar.gz
gmp-4.2.2.tar.bz2
jpegsrc.v6b.tar.gz
libpng-1.2.16.tar.bz2
linux-2.6.23.tar.bz2
lzo_1.08.orig.tar.gz
module-init-tools-3.2.2.tar.bz2
mpfr-2.3.0.patch
mpfr-2.3.0.tar.bz2
mtd_20061007.orig.tar.gz
ncurses-5.5.tar.gz
pkg-config-0.21.tar.gz
tslib-1.0.tar.bz2
uClibc-0.9.29.tar.bz2
udev-114.tar.bz2
zlib-1.2.3.tar.bz2

Note:1)MTD/JFFS2 utilities must use mtd_20061007.orig.tar.gz version

$sudo make WITHOUT_XATTR=1

4. Customizing busybox and uclibc for support NFS boot
$cd /opt/buildroot
$sudo make busybox-menuconfig
$Busybox Settings -> General configuration --> RPC support
$Busybox Settings -> Build Options -> Build BusBox as an static binary
$Linux System Utilities ->mount ->Support mounting NFS file system
$sudo cp project_build_arm/uclibc/busybox-1.7.2/.config package/busybox/busybox-1.6.0.config

$cd /opt/buildroot
$sudo make uclibc-menuconfig
$Networking support -> Remote Procedure Call (RPC) support

$cd /opt/buildroot
$sudo make WITHOUT_XATTR=1

5. Make device node for console
$cd /opt/buildroot/project_build_arm/uclibc/root/dev
$rm console -Rf
$sudo mknod -m 660 console c 5 1
# Need not make device node of null(Note!!!)
# $rm null -Rf
# $sudo mknod -m 660 null c 1 3

6. Modify init scipt （Note：Need not this modification if you have done step 2。1）
$cd /opt/buildroot/project_build_arm/uclibc/root/etc
$modify inittab and uncomment ttyS0 as following:
# Put a getty on the serial port
ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100

$cd buildroot/project_build_arm/uclibc/root/etc/init.d
$Add "/bin/sh" to rcS script at the end of file as following:
......
#add /bin/sh start
echo "QT2410 shell"
/bin/sh
#add /bin/sh end

7. Add cross toolchain to PATH environement（Host PC）
$Modify /etc/profile to add follow content at the end of file:
PATH=$PATH:/opt/buildroot/build_arm/staging_dir/usr/bin
export PATH
8. Done! That's all. ARM Linux cross toolchain and rootfs is completed until now!

9。/opt/buildroot/project_build_arm/uclibc/root/ is a completed rootfs for NFS。