OpenWrt in QEMU

Run

make squashfs

Exit

poweroff

# or new shell
pkill -f qemu-system-aarch64

Prepare

• Ubuntu 24.04 (GNU coreutils for building OpenWrt) or Ubuntu 26.04 (for qemu 10 RVA23)

  sudo apt install qemu-system-arm make u-boot-tools
  

• OpenWrt files https://downloads.openwrt.org/releases/24.10.5/targets/armsr/armv8/

  ls -1 openwrt* u-boot.bin
  
  openwrt-24.10.5-armsr-armv8-generic-ext4-rootfs.img
  openwrt-24.10.5-armsr-armv8-generic-initramfs-kernel.bin
  openwrt-24.10.5-armsr-armv8-generic-kernel.bin
  openwrt-24.10.5-armsr-armv8-generic-squashfs-combined-efi.img
  openwrt-24.10.5-armsr-armv8-generic-squashfs-rootfs.img
  openwrt-24.10.5-armsr-armv8-rootfs.cpio.gz
  u-boot.bin
  

• EFI files

  cp /usr/share/qemu-efi-aarch64/QEMU_EFI.fd QEMU_EFI_64M.fd
  truncate -s 64M QEMU_EFI_64M.fd
  truncate -s 64M varstore.img
  

• UEFI Shell https://github.com/pbatard/UEFI-Shell

  mkdir -p edk2/EFI/BOOT
  cp shellaa64.efi edk2/EFI/BOOT/BOOTAA64.EFI
  
  make uefi-shell
  

• U-Boot boot.scr (as a disk partition)

  mkdir -p u-boot/boot
  cp openwrt-24.10.5-armsr-armv8-generic-kernel.bin u-boot/boot/Image
  touch u-boot/boot.txt

  edit u-boot/boot.txt

  fatload virtio 1 ${kernel_addr_r} /boot/Image
  setenv bootargs root=fe00
  booti ${kernel_addr_r} - ${fdt_addr}

  make boot.scr
  make uboot-env
  
  # enter u-boot
  source ${scriptaddr}

  U-Boot .CONFIG

  CONFIG_BOOTCOMMAND="source ${scriptaddr}"

Network Boot

• Network Boot

Guide

• https://openwrt.org/docs/guide-user/virtualization/qemu
• https://linuxkernel.org.cn/doc/html/latest/admin-guide/nfs/nfsroot.html
• https://linuxkernel.org.cn/doc/html/latest/filesystems/ramfs-rootfs-initramfs.html
• https://linuxkernel.org.cn/doc/html/latest/admin-guide/initrd.html

License

MPL-2.0