linux-6.1.63+busbox1.36.0文件系统制作流程

HOST-OS : ubuntu22.04
kernel  : linux-6.1.63
busybox : 1.36.0

https://mirrors.tuna.tsinghua.edu.cn/kernel/v6.x/linux-6.1.63.tar.xz

2.2 busybox源代码下载

https://busybox.net/downloads/busybox-1.36.0.tar.bz2

make ARCH=x86 x86_64_defconfig
make ARCH=x86 menuconfig

General setup  --->
       ----> [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
Device Drivers  --->
	Generic Driver Options > Support for uevent helper
	[*] Block devices  --->
		<*>   RAM block device support
		(65536) Default RAM disk size (kbytes)
make ARCH=x86  -j$(nproc)

make menuconfig
Settings  --->
	Build Options  --->
		[*] Build BusyBox as a static binary (no shared libs)
make && make install

sudo su
cd busybox-1.36.0/_install
mkdir etc dev mnt
mkdir -p proc sys tmp mnt
mkdir -p etc/init.d/
vim etc/fstab
<--
proc        /proc           proc         defaults        0        0
#tmpfs       /tmp            tmpfs    　　defaults        0        0
sysfs       /sys            sysfs        defaults        0        0
-->
vim etc/init.d/rcS
<--
echo -e "Welcome to te_Linux 20240517"
/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
-->
chmod 755 etc/init.d/rcS
vim etc/inittab
<--
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::askfirst:-/bin/sh
::shutdown:/bin/umount -a -r
::shutdown:/sbin/swapoff -a
::ctrlaltdel:/sbin/reboot
::restart:/sbin/init
-->
chmod 755 etc/inittab
cd dev
mknod console c 5 1
mknod null c 1 3
mknod tty1 c 4 1 

vim mkfs.sh
<--
#!/bin/bash
rm -rf rootfs.ext3
rm -rf fs
dd if=/dev/zero of=./rootfs.ext3 bs=1M count=32
mkfs.ext3 rootfs.ext3
mkdir fs
mount -o loop rootfs.ext3 ./fs
cp -rf ./_install/* ./fs
umount ./fs
gzip --best -c rootfs.ext3 > rootfs.img.gz
-->

qemu-system-x86_64 \
  -kernel ./linux-6.1.63//arch/x86_64/boot/bzImage  \
  -initrd ./busybox-1.36.0/rootfs.img.gz   \
  -append "root=/dev/ram init=/linuxrc"  \
  -serial file:output.txt