BusyBox自建根文件系统完善

添加根文件系统动态库

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mkdir lib
cd /usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/arm-linux-gnueabihf/libc/lib
cp *so* *.a ~/rootfs/lib/ -d

rm ~/rootfs/lib/ld-linux-armhf.so.3
cp ld-linux-armhf.so.3 ~/rootfs/lib/
cd /usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/arm-linux-gnueabihf/lib
cp *so* *.a ~/rootfs/lib/ -d

mkdir ~/rootfs/usr/lib
cd /usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/arm-linux-gnueabihf/libc/usr/lib
cp *so* *.a ~/rootfs/usr/lib/ -d
cd ~/rootfs
du ./lib ./usr/lib/ -sh

mkdir dev
mkdir proc
mkdir mnt
mkdir sys
mkdir tmp
mkdir root

uboot NFS挂载

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root=/dev/nfs nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>] ip=<client-ip>:<server-ip>:<gwip>:<netmask>:<hostname>:<device>:<autoconf>:<dns0-ip>:<dns1-ip>
root=/dev/nfs nfsroot=192.168.3.138:/home/xcc/nfs/rootfs,proto=tcp rw ip=192.168.3.110:192.168.3.138:192.168.3.1:255.255.255.0::eth0:off
setenv bootargs 'console=ttymxc0,115200 root=/dev/nfs nfsroot=192.168.3.138:/home/xcc/nfs/rootfs,proto=tcp rw ip=192.168.3.197:192.168.3.138:192.168.3.1:255.255.255.0::eth0:off'
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run loadfdt
run loadimage
bootz 80800000 - 83000000

mkdir -p etc/init.d

nano etc/init.d/rcS

chmod 777 etc/init.d/rcS

内容

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#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib:/usr/lib
runlevel=S 
umask 022
export PATH LD_LIBRARY_PATH runlevel

#网络开机自启动设置
ifconfig eth0 up
#udhcpc -i eth0 
ifconfig eth0 192.168.1.251 netmask 255.255.255.0
route add default gw 192.168.1.1

mount -a 
mkdir /dev/pts
mount -t devpts devpts /dev/pts

echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s

nano etc/fstab

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#<file system> <mount point> <type> <options> <dump> <pass> 
proc /proc proc defaults 0 0 
tmpfs /tmp tmpfs defaults 0 0 
sysfs /sys sysfs defaults 0 0

nano etc/inittab

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#etc/inittab
::sysinit:/etc/init.d/rcS
console::askfirst:-/bin/sh
::restart:/sbin/init
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r 7 ::shutdown:/sbin/swapoff -a

nfs install

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sudo apt-get install nfs-kernel-server rpcbind
sudo vi /etc/exports
mkdir nfs && chmod 777 nfs
/home/xcc/nfs *(rw,sync,no_root_squash)
sudo /etc/init.d/nfs-kernel-server restart

sudo vim /etc/default/nfs-kernel-server
降低nfs版本，不然内核不能使用挂载
RPCNFSDCOUNT="-V 2 8"

tftp

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sudo apt-get install xinetd -y
sudo apt-get install tftp-hpa tftpd-hpa -y
mkdir tftp && chmod 777 tftp
sudo vi /etc/default/tftpd-hpa
sudo vi /etc/xinetd.d/tftp
server tftp
{
    socket_type = dgram
    wait = yes
    disable = no
    user = root
    protocol = udp
    server = /usr/sbin/in.tftpd
    server_args = -s /home/xcc/tftp -c
    #log_on_success += PID HOST DURATION
    #log_on_failure += HOST
    per_source = 11
    cps =100 2
    flags =IPv4
}

sudo service tftpd-hpa restart
sudo service xinetd restart

自建roofs打包

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cd rootfs/
tar -vcjf rootfs.tar.bz2 *
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#!/bin/bash

busybox_dir=$HOME/imx6ull/busybox
kernel_dir=$HOME/imx6ull/kernel
gcc_lib_root=/opt/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/arm-linux-gnueabihf

share_dir=$HOME/imx6ull/nfs
rootfs_dir=$share_dir/rootfs

dtb_file=imx6ull-alientek-emmc.dtb
device_ip=192.168.3.109
netmask=255.255.255.0
gw=192.168.3.1
nfs_server_ip=`ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6|awk '{print $2}'|tr -d "addr:"`

# env
sudo apt update
sudo apt install cmake gcc wget lsb-core lib32stdc++6 libncurses5-dev build-essential lzop -y

rm $share_dir/* -rf
rm $busybox_dir -rf
rm $kernel_dir -rf
mkdir -p $busybox_dir
mkdir -p $kernel_dir
mkdir -p $rootfs_dir
tar -xvf linux-imx-4.1.15-2.1.0-g3dc0a4b-v2.7.tar.bz2 -C $kernel_dir
tar -xvf busybox-1.29.0.tar.bz2 -C $busybox_dir
mv $busybox_dir/busybox-1.29.0/{.,}* $busybox_dir

# build
cpu_logic_cnt=`cat /proc/cpuinfo | grep "processor" | wc -l`
cd $kernel_dir
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- imx_alientek_emmc_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j$cpu_logic_cnt
if [ $? -ne 0 ]; then
    exit;
fi

cd $busybox_dir
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
wget http://chengs.run/upload/2023/09/busybox_config -O .config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j$cpu_logic_cnt
if [ $? -ne 0 ]; then
    exit;
fi

# rootfs
cd $busybox_dir
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- CONFIG_PREFIX=$rootfs_dir install

cd $rootfs_dir
mkdir lib
mkdir -p usr/lib
mkdir dev
mkdir proc
mkdir mnt
mkdir sys
mkdir tmp
mkdir root
mkdir -p etc/init.d

echo "#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib:/usr/lib
runlevel=S 
umask 022
export PATH LD_LIBRARY_PATH runlevel

#网络开机自启动设置
ifconfig eth0 up
# udhcpc -i eth0 
# ifconfig eth0 ${device_ip} netmask ${netmask}
# route add default gw ${gw}

mount -a 
mkdir /dev/pts
mount -t devpts devpts /dev/pts

echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
" > etc/init.d/rcS

chmod 777 etc/init.d/rcS

echo "#<file system> <mount point> <type> <options> <dump> <pass> 
proc /proc proc defaults 0 0 
tmpfs /tmp tmpfs defaults 0 0 
sysfs /sys sysfs defaults 0 0
" > etc/fstab

echo "#etc/inittab
::sysinit:/etc/init.d/rcS
console::askfirst:-/bin/sh
::restart:/sbin/init
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r 7 ::shutdown:/sbin/swapoff -a
" > etc/inittab

echo "nameserver 8.8.8.8
nameserver ${gw}
" > etc/resolv.conf

# rootfs lib
cd $gcc_lib_root/libc/lib
cp *so* *.a $rootfs_dir/lib/ -d
rm $rootfs_dir/lib/ld-linux-armhf.so.3
cp ld-linux-armhf.so.3 $rootfs_dir/lib/

cd $gcc_lib_root/lib
cp *so* *.a $rootfs_dir/lib/ -d

cd $gcc_lib_root/libc/usr/lib
cp *so* *.a $rootfs_dir/usr/lib/ -d

cd $rootfs_dir
du ./lib ./usr/lib/ -sh

# lib test
echo '''
#include <stdio.h>

int main(int argc, const char* argv[])
{
   printf("helloworld\n");
   return 0;
}
''' >> main.c

arm-linux-gnueabihf-gcc -o main main.c
mv main $rootfs_dir/root
rm main.c

# zImage dtb
cp $kernel_dir/arch/arm/boot/zImage $share_dir
cp $kernel_dir/arch/arm/boot/dts/$dtb_file $share_dir

echo "
# uboot setting
setenv bootcmd 'nfs 80800000 ${nfs_server_ip}:${share_dir}/zImage;nfs 83000000 ${nfs_server_ip}:${share_dir}/${dtb_file};setenv bootargs console=ttymxc0,115200 root=/dev/nfs nfsroot=${nfs_server_ip}:${rootfs_dir},proto=tcp rw ip=${device_ip}:${nfs_server_ip}:${gw}:${netmask}::eth0:off;bootz 80800000 - 83000000;'
"