initial buildroot for linux 5.15

boot/boot-wrapper-aarch64/Config.in

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+comment "boot-wrapper-aarch64 needs a Linux kernel to be built"
+	depends on BR2_aarch64
+	depends on !BR2_LINUX_KERNEL
+
+config BR2_TARGET_BOOT_WRAPPER_AARCH64
+	bool "boot-wrapper-aarch64"
+	depends on BR2_aarch64
+	depends on BR2_LINUX_KERNEL
+	help
+	  The boot-wrapper-aarch64 is a small bootloader that makes it
+	  possible to start an Aarch64 kernel inside the available
+	  software simulators for the Aarch64 architecture.
+
+	  git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git
+
+if BR2_TARGET_BOOT_WRAPPER_AARCH64
+
+config BR2_TARGET_BOOT_WRAPPER_AARCH64_DTS
+	string "Device Tree Source name"
+	default ""
+	help
+	  Name of the Device Tree Source file to use to generate the
+	  Device Tree Blob that will be embedded in the image
+	  generated by the boot wrapper. Valid names are the .dts
+	  files from arch/arm64/boot/dts/ in the kernel source
+	  tree. The name must be specified without the .dts suffix.
+
+config BR2_TARGET_BOOT_WRAPPER_AARCH64_BOOTARGS
+	string "Kernel bootargs"
+	default ""
+	help
+	  Kernel bootargs to embed inside the image generated by the
+	  boot wrapper.
+
+config BR2_TARGET_BOOT_WRAPPER_AARCH64_PSCI
+	bool "Boot secondary SMP cores using PSCI"
+	help
+	  Boot secondary SMP cores using PSCI firmware calls. If
+	  disabled, the spin-table method is used instead.
+
+config BR2_TARGET_BOOT_WRAPPER_AARCH64_GICV3
+	bool "Enable GICv3 instead of GICv2"
+	help
+	  Boot using GICv3 instead of GICv2.
+
+endif

boot/boot-wrapper-aarch64/boot-wrapper-aarch64.mk

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+################################################################################
+#
+# boot-wrapper-aarch64
+#
+################################################################################
+
+BOOT_WRAPPER_AARCH64_VERSION = 8d5a765251d9113c3c0f9fa14de42a9e7486fe8a
+BOOT_WRAPPER_AARCH64_SITE = git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git
+BOOT_WRAPPER_AARCH64_LICENSE = BSD-3-Clause
+BOOT_WRAPPER_AARCH64_LICENSE_FILES = LICENSE.txt
+BOOT_WRAPPER_AARCH64_DEPENDENCIES = linux
+BOOT_WRAPPER_AARCH64_INSTALL_IMAGES = YES
+
+# The Git repository does not have the generated configure script and
+# Makefile.
+BOOT_WRAPPER_AARCH64_AUTORECONF = YES
+
+BOOT_WRAPPER_AARCH64_DTB = $(LINUX_DIR)/arch/arm64/boot/dts/$(basename $(call qstrip,$(BR2_TARGET_BOOT_WRAPPER_AARCH64_DTS))).dtb
+
+BOOT_WRAPPER_AARCH64_CONF_OPTS = \
+	--with-kernel-dir=$(LINUX_DIR) \
+	--with-dtb=$(BOOT_WRAPPER_AARCH64_DTB) \
+	--with-cmdline=$(BR2_TARGET_BOOT_WRAPPER_AARCH64_BOOTARGS)
+
+ifeq ($(BR2_TARGET_BOOT_WRAPPER_AARCH64_PSCI),y)
+BOOT_WRAPPER_AARCH64_CONF_OPTS += --enable-psci
+else
+BOOT_WRAPPER_AARCH64_CONF_OPTS += --disable-psci
+endif
+
+ifeq ($(BR2_TARGET_BOOT_WRAPPER_AARCH64_GICV3),y)
+BOOT_WRAPPER_AARCH64_CONF_OPTS += --enable-gicv3
+endif
+
+# We need to convince the configure script that the Linux kernel tree
+# exists, as well as the DTB and the kernel Image. Even though those
+# are available on the build machine, the configure script uses
+# AC_CHECK_FILE tests, which are always disabled in cross-compilation
+# situations.
+BOOT_WRAPPER_AARCH64_CONF_ENV = \
+	$(call AUTOCONF_AC_CHECK_FILE_VAL,$(LINUX_DIR))=yes \
+	$(call AUTOCONF_AC_CHECK_FILE_VAL,$(LINUX_DIR)$(BOOT_WRAPPER_AARCH64_DTB))=yes \
+	$(call AUTOCONF_AC_CHECK_FILE_VAL,$(LINUX_DIR)/arch/arm64/boot/Image)=yes
+
+define BOOT_WRAPPER_AARCH64_INSTALL_IMAGES_CMDS
+	cp $(@D)/linux-system.axf $(BINARIES_DIR)
+endef
+
+$(eval $(autotools-package))