Make EFI port primary

scripts/out_to_iso.sh

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+# Create a FAT12 image
+dd if=/dev/zero of=out/fat.img bs=1k count=1440
+mformat -i out/fat.img -f 1440 ::
+
+# Create EFI directory structure
+mmd -i out/fat.img ::/EFI
+mmd -i out/fat.img ::/EFI/BOOT
+
+# Copy the EFI application
+mcopy -i out/fat.img out/img/EFI/BOOT/BOOTX64.EFI ::/EFI/BOOT
+
+# Verify content
+echo "Verifying FAT image content:"
+mdir -i out/fat.img -/ ::
+
+# Create the ISO
+# -e specifies the boot image (the FAT image)
+# -no-emul-boot is required for UEFI
+xorriso -as mkisofs -R -f -e /fat.img -no-emul-boot -volid LintsEFI -o out/lints.iso out/img out/fat.img