buildroot qemu_system_x86_64

enter buildroot-2024.05.1

make qemu_x86_64_defconfig
make menuconfig

    Toolchain -> C library -> glibc
    System Configuration -> Run a getty (login prompt) after boot -> TTY port -> ttyS0

    Target Packages -> Hardware Handling -> pciutils
make with -jN

sudo ip tuntap add mode tap mytap0

qemu-system-x86_64 -M pc -kernel bzImage -drive file=rootfs.ext2,if=virtio,format=raw -append "root=/dev/vda console=ttyS0" -nographic -netdev tap,id=mynet0,ifname=mytap0,script=no,downscript=no -device e1000,netdev=mynet0,mac=00:00:00:00:00:01