#MASTER / ARM 32 :

	#After having installed
	apt install pkg-config automake autopoint crossbuild-essential-armhf

	git clone git://git.savannah.gnu.org/grub.git && cd grub && ./bootstrap && ./configure --target=arm-linux-gnueabihf --with-platform=efi --prefix=/home/user/Desktop/grub/ && make -j 8 && make install
	/home/user/Desktop/grub/bin/grub-mkstandalone -o bootarm.efi -O arm-efi --directory /home/user/Desktop/grub/lib/grub/arm-efi

	#Then I created a GPT USB Stick with ESP/FAT32 partition (marked as EFI System Partition) in which /EFI/boot/bootarm.efi is placed, unmounted it, and made an image of it at /home/user/Desktop/esp/esp-master.img

	cd /home/user/Desktop/esp
	qemu-system-arm -M virt -m 512 -net none -monitor none -parallel none -L ./ -bios QEMU_EFI_ARM.fd -drive format=raw,file=esp-master.img

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#MASTER / ARM 64 :

	git clone git://git.savannah.gnu.org/grub.git && cd grub && ./bootstrap && ./configure --target=aarch64-linux-gnu --with-platform=efi --prefix=/home/user/Desktop/grub-arm64-efi && make -j 8 && make install
	cd ..
	/home/user/Desktop/grub-arm64-efi/bin/grub-mkstandalone -o bootaa64.efi -O arm64-efi --directory /home/user/Desktop/grub-arm64-efi/lib/grub/arm64-efi/
	qemu-system-aarch64 -M virt -cpu cortex-a57 -m 2048 -monitor none -parallel none -L ./ -bios QEMU_EFI_AA64.fd -drive format=raw,file=esp-master.img

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QEMU_EFI_ARM firmwares :
	https://efi.akeo.ie/QEMU_EFI/
	https://wiki.linaro.org/LEG/UEFIforQEMU
	wget http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-ARM/DEBUG_GCC5/QEMU_EFI.fd
	wget http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-ARM/RELEASE_GCC5/QEMU_EFI.fd
	
Another one, split in 2 files (the first one can be used as bios) :
	https://packages.debian.org/buster/qemu-efi-arm
	seems that you can use "-flash firstFile -flash secondFile", instead of "-bios firstFile"

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Crossbuilding u-boot.bin for ARM, using x86_64 computer (having crossbuild-essential-armhf installed)

	git clone git://git.denx.de/u-boot-efi.git
	cd u-boot-efi/
	make ARCH=arm qemu_arm_defconfig
	make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j 8


#Running the /EFI/boot/bootarm.efi (placed into esp-master.img) from u-boot.bin bios :
qemu-system-arm -M virt -m 512 -net none -monitor none -parallel none -L U-BOOT -bios u-boot.bin -drive format=raw,file=esp-master.img
	virtio scan
	virtio info
	virtio part
	load virtio 0:1 ${kernel_addr_r} EFI/boot/bootarm.efi
	bootefi ${kernel_addr_r}


#Building the RFC modified GRUB
	mkdir /home/user/Desktop/grub-rfc
	cd /home/user/Desktop/grub-rfc
	git clone git://git.savannah.gnu.org/grub.git
	#modifying grub/include/grub/efi/pe32.h 
	cd grub && ./bootstrap && ./configure --target=arm-linux-gnueabihf --with-platform=efi --prefix=/home/user/Desktop/grub-rfc/ && make -j 8 && make install
	cd ..
	/home/user/Desktop/grub-rfc/bin/grub-mkstandalone -o bootarm-rfc.efi -O arm-efi --directory /home/user/Desktop/grub-rfc/lib/grub/arm-efi
	#placing the file into an ESP and doing and image of it, named esp-rfc-arm.img

#Running it on QEMU :
	qemu-system-arm -M virt -m 512 -net none -monitor none -parallel none -L U-BOOT -bios u-boot.bin -drive format=raw,file=esp-rfc-arm.img

#Once inside QEMU :
	virtio scan
	load virtio 0:1 ${kernel_addr_r} EFI/boot/bootarm-rfc.efi
	bootefi ${kernel_addr_r}

=> Works with modified grub/include/grub/efi/pe32.h.