initial buildroot for linux 5.15

board/aarch64-efi/genimage-efi.cfg

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+image efi-part.vfat {
+	vfat {
+		file EFI {
+			image = "efi-part/EFI"
+		}
+		file Image {
+			image = "Image"
+		}
+	}
+
+	size = 32M
+}
+
+image disk.img {
+	hdimage {
+		gpt = true
+	}
+
+	partition boot {
+		image = "efi-part.vfat"
+		partition-type-uuid = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
+		offset = 32K
+		bootable = true
+	}
+
+	partition root {
+		partition-type-uuid = b921b045-1df0-41c3-af44-4c6f280d3fae
+		image = "rootfs.ext2"
+	}
+}

board/aarch64-efi/grub.cfg

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+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+	linux /Image root=PARTLABEL=root rootwait
+}

board/aarch64-efi/post-image.sh

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+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+
+cp -f ${BOARD_DIR}/grub.cfg ${BINARIES_DIR}/efi-part/EFI/BOOT/grub.cfg

board/aarch64-efi/readme.txt

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+
+The aarch64_efi_defconfig allows to build a minimal Linux system that
+can boot on all AArch64 servers providing an EFI firmware.
+
+This includes all Arm EBBR[1] compliant systems, and all Arm SystemReady[2]
+compliant systems for example.
+
+
+Building and booting
+====================
+
+$ make aarch64_efi_defconfig
+$ make
+
+The file output/images/disk.img is a complete disk image that can be
+booted, it includes the grub2 bootloader, Linux kernel and root
+filesystem.
+
+Testing under Qemu
+==================
+
+This image can also be tested using Qemu:
+
+qemu-system-aarch64 \
+	-M virt \
+	-cpu cortex-a57 \
+	-m 512 \
+	-nographic \
+	-bios </path/to/QEMU_EFI.fd> \
+	-drive file=output/images/disk.img,if=none,format=raw,id=hd0 \
+	-device virtio-blk-device,drive=hd0 \
+	-netdev user,id=eth0 \
+	-device virtio-net-device,netdev=eth0
+
+Note that </path/to/QEMU_EFI.fd> needs to point to a valid aarch64 UEFI
+firmware image for qemu.
+It may be provided by your distribution as a edk2-aarch64 or AAVMF
+package, in path such as /usr/share/edk2/aarch64/QEMU_EFI.fd .
+
+U-Boot based qemu firmware
+==========================
+
+A qemu firmware with support for UEFI based on U-Boot can be built following
+the instructions in [3], with qemu_arm64_defconfig.
+
+This should give you a nor_flash.bin, which you can use with qemu as an
+alternative to QEMU_EFI.fd. You will also need to change the machine
+specification to "-M virt,secure" on qemu command line, to enable TrustZone
+support, and you will need to increase the memory with "-m 1024".
+
+[1]: https://github.com/ARM-software/ebbr
+[2]: https://developer.arm.com/architectures/system-architectures/arm-systemready
+[3]: https://github.com/glikely/u-boot-tfa-build