Disk /dev/sda: 489.1 GiB, 525112713216 bytes, 1025610768 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: xxxxxxxxxxxxxxxxxxxxxxxx

Device       Start        End    Sectors   Size Type
/dev/sda1     2048    1050623    1048576   512M EFI System
/dev/sda2  1050624 1025610734 1024560111 488.6G Linux filesystem

# Begin /boot/grub/grub.cfg
  set default=0
  set timeout=5

  insmod gzio
  insmod part_gpt
  insmod ext2
  set root=(hd0, gpt2)
  # hd[x] is the drive of the LFS partion and gpt[y] is the partition

  insmod efi_gop
  insmod efi_uga
  insmod font
  if loadfont /grub/unicode.pf2; then
    loadfont /grub/unicode.pf2
    set gfxmode=auto
    insmod gfxterm
    set gfxpayload=keep
    terminal_output gfxterm
  fi

  menuentry "GNU/Linux, Linux 5.2.1-lfs-20190714-systemd"  {
    linux   /boot/vmlinuz-5.2.1-lfs-20190714-systemd root=/dev/sda2 ro console=tty0 console=ttyS0
    initrd  /boot/initramfs.cpio.gz
  }

#!/bin/busybox sh

# Mount the /proc and /sys filesystems.
mount -t proc none /proc
mount -t sysfs none /sys

# Do your stuff here.
echo "This script just mounts and boots the rootfs, nothing else!"

# Mount the root filesystem.
mount -o ro /dev/sda2 /mnt/root

# Clean up.
umount /proc
umount /sys

#exec /bin/sh
#Boot the real thing.
exec switch_root /mnt/root /sbin/init

sudo ./qemu-system-x86_64
--bios /src/edk2/Build/OvmfX64/DEBUG_GCC5/FV/OVMF.fd
-nographic -net none
-drive file=/dev/sda,index=0,media=disk,format=raw