make_targets: Add Kernel Image install support

kernel/kernel-4.9/arch/arm64/Makefile

@@ -158,6 +158,9 @@ dtbs: scripts
 dtbs_install:
 	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 
+kernel_install:
+	$(Q)$(MAKE) $(kernelinst)=$(boot)/
+
 Image-dtb Image.gz-dtb: vmlinux scripts dtbs
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 

kernel/kernel-4.9/scripts/Kbuild.include

@@ -254,6 +254,7 @@ modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
 # Usage:
 # $(Q)$(MAKE) $(dtbinst)=dir
 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
+kernelinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.kernelinst obj
 
 ###
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=

kernel/kernel-4.9/scripts/Makefile.kernelinst

@@ -0,0 +1,34 @@
+# ==========================================================================
+# Installing Image file
+#
+# Installs Image file from INSTALL_IMAGE_PATH directory or the default location:
+#
+# ==========================================================================
+
+src := $(obj)
+
+PHONY := __kernel_install
+__kernel_install:
+
+export kernelinst-root ?= $(obj)
+
+include include/config/auto.conf
+include scripts/Kbuild.include
+include $(src)/Makefile
+
+PHONY += __kernel_install_prep
+__kernel_install_prep:
+ifeq ("$(kernelinst-root)", "$(obj)")
+	$(Q)mkdir -p $(INSTALL_PATH)
+endif
+
+# Helper targets for Installing Kernel into the boot directory
+quiet_cmd_kernel_install =	INSTALL $(2)
+cmd_kernel_install =	mkdir -p $(2); cp $(kernelinst-root)$(2) $(3);
+
+install-dir = $(patsubst $(kernelinst-root)%,$(INSTALL_PATH)%,$(obj))
+
+__kernel_install:
+	$(call cmd,kernel_install,Image,$(install-dir))
+
+.PHONY: __kernel_install