create a Grub2 bootable image and run with QEMU

1-simple-qemu-shell-build.md

image.sh is a copy of gists: Gamer-Guy12/7734ffde77f582aef124a0610221e3a5

grub.cfg is a copy of gists: Gamer-Guy12/d849c4a6d02869e569bceaca8a61f44b

grub.cfg

insmod part_gpt

menuentry "MYOS" {
  echo "Here"
  sleep 6
}
 

image.sh

#!/bin/bash

rm -f disk.img

dd if=/dev/zero of=disk.img bs=1M count=256
parted disk.img mklabel gpt
parted disk.img mkpart ESP fat32 1MiB 255MiB
parted disk.img set 1 esp on
LOOPBACK=$(losetup -o $((2048 * 512)) --sizelimit $((254 * 1024 * 1024)) -f disk.img --show)

mkfs.vfat -F 16 -n "EFI System" $LOOPBACK

mkdir img
mount $LOOPBACK img

grub-install \
  --target=x86_64-efi \
  --efi-directory=img \
  --boot-directory=img/boot \
  --removable \
  --no-nvram

cp boot/ img/ -r

umount img
rm -r img

losetup -d $LOOPBACK

run-qemu.sh

qemu-system-x86_64 \
  -drive format=raw,file=disk.img \
  -m 4096M \
  -d int,cpu_reset \
  -no-reboot \
  -bios OVMF_CODE.fd

# get ovmf from here https://github.com/osdev0/edk2-ovmf-nightly

# if not working, try running QEMU with following flags:
#   -M accel=tcg,smm=off
#   -d int
#   -no-reboot
#   -no-shutdown