Creating a thin Linux kernel instance using BusyBox

BusyBox

A binary program that simulates the implementation of many programs.

/bin/busybox

To view native hardware device information:

#cat/proc/cpuinfo

#cat/proc/meminfo

#lsusb Displays the USB interface information.

#lspci displays all devices on the PCI bus.

#hal-device displays detailed information for all hardware.

Hardware abstract layer hardware abstraction.

Compile BusyBox:

#tar XF busybox.tar.bz2

#cd BusyBox

#make Menuconfig

Busybox Settings

Build Options

Build BusyBox as a static binary (no share libs) (NEW)

Installation Options ("Make Install" behavior)

You can specify the address generated by the. Install file.

#make Install

If make install error, this kernel version is missing some header files, need to download the updated kernel.

#tar XF linux-xxx.tar.bz2-c/usr/src

#cp-R/linux-xxx/include/mtd/ubi-user.h/root/busybox/include/mtd/

Use BusyBox to create the system kernel.

0. Mount the relevant equipment:

#mount/dev/sdb1/mnt/boot

#mount/dev/sdb2/mnt/sysroot

1. Compiling BusyBox

#tar XF busybox.tar.bz2

#cd BusyBox

#make Menuconfig

Busybox Settings

Build Options

Build BusyBox as a static binary (no share libs) (NEW)

Installation Options ("Make Install" behavior)

You can specify the address generated by the. Install file.

#make Install

3. Make INITRD file:

1. Copy the entire contents of the _install in the BusyBox directory:

#cp-A _install/tmp/busybox

#ls/tmp/busybox

Bin Linuxrc sbin usr

#rm LINUXRC

2. Create the appropriate directory:

#mkdir-P etc dev lib proc mnt/sysroot tmp

3. Copy the relevant libraries required by EXT3.

#cp/lib/modules/kernelversion/kernel/fs/jbd/jbd.ko/tmp/busybox/lib/modules/

#cp/lib/modules/kernelversion/kernel/fs/ext3/ext3.ko/tmp/busybox/lib/modules/

4. Create the init file.

#vim/tmp/busybox/etc/rc.d/init

#!/bin/sh

MOUNT-T proc Proc/proc

Mount-t Sysfs Sysfs/sys

Insmod/lib/modules/jbd.ko

Insmod/lib/modules/ext3.ko

Mdev-s

Mount-t Ext3/dev/sda2/mnt/sysroot

EXEC switch_root/mnt/sysroot/sbin/init

#chmod +x Init

5. Create 2 necessary device files.

#mknod/tmp/busybox/dev/console C 5 1

#mknod/tmp/busybox/dev/null C 1 3

6. Create the Initrd file:

#cd/tmp/busybox

#find. | Cpio-h newc-o--quiet |gzip-9>/mnt/boot/

Initrd.gz

4. Copy the Vmlinux file from the current system:

#cp/boot/vmlinux-xxx.el5/mnt/boot/vmlinux

5. Install Grub:

#grub-install--root-directory=/mnt/boot/dev/sdb

6. Create the grub.conf file:

#vim/mnt/boot/grub/grub.conf

Default=0

Timeout=3

Title=my Linux

Root (hd0,0)

Kernel/vmlinux ro root=/dev/hda2 Quiet

Initrd/initrd.gz

7. Create the relevant file system:

#cd BusyBox

#cp _inistall/mnt/sysroot

#cd/mnt/sysroot

#rm LINUXRC

#mkdir-pv lib/modules proc sys Dev ETC/RC.D/INIT.D root mnt media

#mkdir-PV root tmp home var/{log,run,lock/subsys,tmp} usr/{bin,sbin,local} opt boot

8. Create the Inittab file:

#cd/mnt/sysroot/etc

#vim Inittab

:: Sysinit:/etc/rc.d/rc.sysinit

Console::reapawn:-/bin/sh

:: Ctrlaltdel:/sbin/reboot

:: Shutdonw:/bin/umount-a-R

9. Create a Fstab file

#vim Fstab

Sysfs/sys Sysfs Defaults 0 0

PROC/PORC proc Defaults 0 0

/dev/hda1/boot ext3 defaults 0 0

/DEV/HDA2/EXT3 defaaults 1 1

10. Create the necessary device files:

#mknod/mnt/sysroot/dev/console C 5 1

#mknod/mnt/sysroot/dev/null C 1 3

11. Create the Initrd file:

#vim/mnt/sysroot/etc/rc.d/rc.sysinit

#!/bin/bash

Echo-e "\twelcom to \e33[34mmy linux\033[0m"

Echo-e "Remounting root ... [\033[32mok\033[0m] "

MOUNT-T proc Proc/proc

Mount-t Sysfs Sysfs/sys

Echo-e "Creating Files of device ... [\033[32mok\033[0m] "

Mdev-s

ECHO-E "Mounting the filesystem ... [\033[32mok\033[0m] "

Mount-a

Swapon-a

#chmod +x/mnt/sysroot/etc/rc.d/rc.sysinit

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Creating a thin Linux kernel instance using BusyBox