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有兴趣的同学可参考该文档将其完善
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前奏

rambo@debian:~$ cat /etc/issue
Debian GNU/Linux 12 \n \l
 
rambo@debian:~$ free -h
               total        used        free      shared  buff/cache   available
Mem:            15Gi       718Mi        14Gi       4.7Mi       370Mi        14Gi
Swap:          975Mi          0B       975Mi
 
# 查看逻辑CPU的个数
rambo@debian:~$ cat /proc/cpuinfo| grep "processor"| wc -l
8
 
 
 
rambo@debian:~$ cat /etc/apt/sources.list
deb https://mirrors.aliyun.com/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.aliyun.com/debian-security/ bookworm-security main
deb-src https://mirrors.aliyun.com/debian-security/ bookworm-security main
deb https://mirrors.aliyun.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.aliyun.com/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm-backports main non-free non-free-firmware contrib
 
deb https://mirrors.ustc.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.ustc.edu.cn/debian-security/ bookworm-security main
deb-src https://mirrors.ustc.edu.cn/debian-security/ bookworm-security main
deb https://mirrors.ustc.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.ustc.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
 
 
 
rambo@debian:~$ sudo apt -y update
 
rambo@debian:~$ sudo apt install -y make gcc libncurses-dev build-essential flex bison libssl-dev libelf-dev dwarves time

下载linux内核源码并编译

rambo@debian:~$ wget https://mirror.bjtu.edu.cn/kernel/linux/kernel/v6.x/linux-6.5.7.tar.gz
rambo@debian:~$ tar -zxvf linux-6.5.7.tar.gz
rambo@debian:~$ cd linux-6.5.7/
rambo@debian:~/linux-6.5.7$ make menuconfig
General setup  --->
       ----> [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support

    Device Drivers  --->
       [*] Block devices  --->
            <*>   RAM block device support
           (65536) Default RAM disk size (kbytes) 



rambo@debian:~/linux-6.5.7$ make -j10
编译成功后的内核位置：
rambo@debian:~$ ls linux-6.5.7/arch/x86_64/boot/bzImage

下载busybox的源代码

rambo@debian:~$ wget https://www.busybox.net/downloads/busybox-1.36.1.tar.bz2
rambo@debian:~$ tar -jxvf busybox-1.36.1.tar.bz2
rambo@debian:~$ cd busybox-1.36.1
rambo@debian:~/busybox-1.36.1$ make menuconfig
注：将buxybox设置成静态编译，如下项打开
Settings --->[*] Build static binary (no shared libs)


rambo@debian:~/busybox-1.36.1$ make && make install
注：编译完成后的busybox就安装在源码根目录下的_install目录了，我们进入_install目录，补充一些必要的文件或目录

rambo@debian:~/busybox-1.36.1$ cd _install/
rambo@debian:~/busybox-1.36.1$ mkdir -p etc dev mnt proc sys tmp mnt etc/init.d/
rambo@debian:~/busybox-1.36.1$ vim etc/fstab
proc     /proc   proc     defaults   0  0
tmpfs    /tmp    tmpfs    defaults   0  0
sysfs    /sys    sysfs    defaults   0  0

rambo@debian:~/busybox-1.36.1$ vim etc/init.d/rcS
echo -e "WELCOME TO TEST_LINUX"
/bin/mount -a
echo -e "Remounting the root filesystem"
mount  -o  remount,rw  /
mkdir -p /dev/pts
mount -t devpts devpts /dev/pts
echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s


rambo@debian:~/busybox-1.36.1$ chmod 755 etc/init.d/rcS
rambo@debian:~/busybox-1.36.1$ vim etc/inittab
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::askfirst:-/bin/sh
::ctrlaltdel:/bin/umount -a -r

rambo@debian:~/busybox-1.36.1$ chmod 755 etc/inittab
rambo@debian:~/busybox-1.36.1/_install$ cd dev
rambo@debian:~/busybox-1.36.1/_install/dev$ 


rambo@debian:~/busybox-1.36.1/_install/dev$ 
sudo mknod console c 5 1
sudo mknod null  c 1 3
sudo mknod tty1  c 4 1
sudo mknod ttyS0 c 4 64


rambo@debian:~/busybox-1.36.1/_install/dev$ cd ../..

制作根文件系统镜像文件

rambo@debian:~/busybox-1.36.1$ dd if=/dev/zero of=./rootfs.ext4 bs=1M count=32
rambo@debian:~/busybox-1.36.1$ sudo mkfs.ext4 rootfs.ext4
rambo@debian:~/busybox-1.36.1$ mkdir fs
rambo@debian:~/busybox-1.36.1$ sudo mount -t ext4 -o loop rootfs.ext4  ./fs
rambo@debian:~/busybox-1.36.1$ df -h | grep busybox
/dev/loop0       26M   14K   23M   1% /home/rambo/busybox-1.36.1/fs

rambo@debian:~/busybox-1.36.1$ sudo cp -rf ./_install/* ./fs
rambo@debian:~/busybox-1.36.1$ sudo umount ./fs
rambo@debian:~/busybox-1.36.1$ gzip --best -c rootfs.ext4 > rootfs.img.gz
rambo@debian:~/busybox-1.36.1$ ls -alh rootfs.img.gz 
-rw-r--r-- 1 rambo rambo 1.3M Oct 13 09:15 rootfs.img.gz

rambo@debian:~/busybox-1.36.1$ cd

安装qemu

rambo@debian:~$ sudo apt install -y qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils qemu-system-ppc64 vim

rambo@debian:~$ sudo qemu-system-x86_64 \
  -kernel  ~/linux-6.5.7/arch/x86_64/boot/bzImage  \
  -initrd  ~/busybox-1.36.1/rootfs.img.gz   \
  -append "console=ttyS0"  \
  -nographic -enable-kvm



sudo qemu-system-x86_64 \
-kernel ~/linux-6.5.7/arch/x86_64/boot/bzImage \
-initrd ~/initramfs.cpio.gz \
-nographic -enable-kvm \
-append "console=ttyS0" 



启动不成功....