diff --git a/openwrt_patches-21.02/9989-sbc-secure-boot-and-anti-rollback-support.patch b/openwrt_patches-21.02/9989-sbc-secure-boot-and-anti-rollback-support.patch
new file mode 100644
index 0000000..6bce579
--- /dev/null
+++ b/openwrt_patches-21.02/9989-sbc-secure-boot-and-anti-rollback-support.patch
@@ -0,0 +1,213 @@
+--- a/include/image.mk
++++ b/include/image.mk
+@@ -227,8 +227,7 @@ $(eval $(foreach S,$(NAND_BLOCKSIZE),$(c
+ define Image/mkfs/squashfs-common
+ 	$(STAGING_DIR_HOST)/bin/mksquashfs4 $(call mkfs_target_dir,$(1)) $@ \
+ 		-nopad -noappend -root-owned \
+-		-comp $(SQUASHFSCOMP) $(SQUASHFSOPT) \
+-		-processors 1
++		-comp $(SQUASHFSCOMP) $(SQUASHFSOPT)
+ endef
+ 
+ ifeq ($(CONFIG_TARGET_ROOTFS_SECURITY_LABELS),y)
+@@ -441,6 +440,9 @@ else
+   DEVICE_CHECK_PROFILE = $(CONFIG_TARGET_$(if $(CONFIG_TARGET_MULTI_PROFILE),DEVICE_)$(call target_conf,$(BOARD)$(if $(SUBTARGET),_$(SUBTARGET)))_$(1))
+ endif
+ 
++DEVICE_CHECK_FIT_KEY = $(if $(wildcard $(FIT_KEY_DIR)/$(FIT_KEY_NAME).key),install-images,install-disabled)
++DEVICE_CHECK_FIT_DIR = $(if $(FIT_KEY_DIR),$(DEVICE_CHECK_FIT_KEY),install-images)
++
+ DEVICE_EXTRA_PACKAGES = $(call qstrip,$(CONFIG_TARGET_DEVICE_PACKAGES_$(call target_conf,$(BOARD)$(if $(SUBTARGET),_$(SUBTARGET)))_DEVICE_$(1)))
+ 
+ define merge_packages
+@@ -463,7 +465,7 @@ endef
+ define Device/Check
+   $(Device/Check/Common)
+   KDIR_KERNEL_IMAGE := $(KDIR)/$(1)$$(KERNEL_SUFFIX)
+-  _TARGET := $$(if $$(_PROFILE_SET),install-images,install-disabled)
++  _TARGET := $$(if $$(_PROFILE_SET),$$(DEVICE_CHECK_FIT_DIR),install-disabled)
+   ifndef IB
+     _COMPILE_TARGET := $$(if $(CONFIG_IB)$$(_PROFILE_SET),compile,compile-disabled)
+   endif
+--- a/scripts/mkits.sh
++++ b/scripts/mkits.sh
+@@ -17,6 +17,7 @@
+ usage() {
+ 	printf "Usage: %s -A arch -C comp -a addr -e entry" "$(basename "$0")"
+ 	printf " -v version -k kernel [-D name -n address -d dtb] -o its_file"
++	printf " [-s script] [-S key_name_hint] [-r ar_ver]"
+ 
+ 	printf "\n\t-A ==> set architecture to 'arch'"
+ 	printf "\n\t-C ==> set compression type 'comp'"
+@@ -28,13 +29,16 @@ usage() {
+ 	printf "\n\t-D ==> human friendly Device Tree Blob 'name'"
+ 	printf "\n\t-n ==> fdt unit-address 'address'"
+ 	printf "\n\t-d ==> include Device Tree Blob 'dtb'"
+-	printf "\n\t-o ==> create output file 'its_file'\n"
++	printf "\n\t-o ==> create output file 'its_file'"
++	printf "\n\t-s ==> include u-boot script 'script'"
++	printf "\n\t-S ==> add signature at configurations and assign its key_name_hint by 'key_name_hint'"
++	printf "\n\t-r ==> set anti-rollback version to 'fw_ar_ver' (dec)\n"
+ 	exit 1
+ }
+ 
+ FDTNUM=1
+ 
+-while getopts ":A:a:c:C:D:d:e:k:n:o:v:" OPTION
++while getopts ":A:a:c:C:D:d:e:k:n:o:v:s:S:r:" OPTION
+ do
+ 	case $OPTION in
+ 		A ) ARCH=$OPTARG;;
+@@ -48,6 +52,9 @@ do
+ 		n ) FDTNUM=$OPTARG;;
+ 		o ) OUTPUT=$OPTARG;;
+ 		v ) VERSION=$OPTARG;;
++		s ) UBOOT_SCRIPT=$OPTARG;;
++		S ) KEY_NAME_HINT=$OPTARG;;
++		r ) AR_VER=$OPTARG;;
+ 		* ) echo "Invalid option passed to '$0' (options:$*)"
+ 		usage;;
+ 	esac
+@@ -132,6 +139,56 @@ if [ -n "${AR_VER}" ]; then
+ "
+ fi
+ 
++# Conditionally create script information
++if [ -n "${UBOOT_SCRIPT}" ]; then
++	SCRIPT="\
++		script@1 {
++			description = \"U-Boot Script\";
++			data = /incbin/(\"${UBOOT_SCRIPT}\");
++			type = \"script\";
++			arch = \"${ARCH}\";
++			os = \"linux\";
++			load = <0>;
++			entry = <0>;
++			compression = \"none\";
++			hash@1 {
++				algo = \"crc32\";
++			};
++			hash@2 {
++				algo = \"sha1\";
++			};
++		};\
++"
++	LOADABLES="\
++			loadables = \"script@1\";\
++"
++	SIGN_IMAGES="\
++				sign-images = \"fdt\", \"kernel\", \"loadables\";\
++"
++else
++	SIGN_IMAGES="\
++				sign-images = \"fdt\", \"kernel\";\
++"
++fi
++
++# Conditionally create signature information
++if [ -n "${KEY_NAME_HINT}" ]; then
++	SIGNATURE="\
++			signature {
++				algo = \"sha1,rsa2048\";
++				key-name-hint = \"${KEY_NAME_HINT}\";
++${SIGN_IMAGES}
++			};\
++"
++fi
++
++# Conditionally create anti-rollback version information
++if [ -n "${AR_VER}" ]; then
++	FW_AR_VER="\
++			fw_ar_ver = <${AR_VER}>;\
++"
++fi
++
+ # Create a default, fully populated DTS file
+ DATA="/dts-v1/;
+ 
+@@ -157,14 +214,18 @@ DATA="/dts-v1/;
+ 			};
+ 		};
+ ${FDT_NODE}
++${SCRIPT}
+ 	};
+ 
+ 	configurations {
+ 		default = \"${CONFIG}\";
+ 		${CONFIG} {
+ 			description = \"OpenWrt\";
++${FW_AR_VER}
++${LOADABLES}
+ 			kernel = \"kernel@1\";
+ 			${FDT_PROP}
++${SIGNATURE}
+ 		};
+ 	};
+ };"
+--- a/target/linux/mediatek/image/Makefile
++++ b/target/linux/mediatek/image/Makefile
+@@ -16,6 +16,55 @@ define Build/sysupgrade-emmc
+ 		$(IMAGE_ROOTFS)
+ endef
+ 
++# build squashfs-hashed
++define Build/squashfs-hashed
++	$(CP) $(ROOTFS/$(FILESYSTEMS)/$(DEVICE_NAME)) $(ROOTFS/$(FILESYSTEMS)/$(DEVICE_NAME))-hashed
++	$(TOPDIR)/scripts/make-squashfs-hashed.sh \
++		$(ROOTFS/$(FILESYSTEMS)/$(DEVICE_NAME))-hashed \
++		$(STAGING_DIR_HOST) \
++		$(TOPDIR) \
++		$(ROOTFS/$(FILESYSTEMS)/$(DEVICE_NAME))-hashed-summary
++	cat $(ROOTFS/$(FILESYSTEMS)/$(DEVICE_NAME))-hashed-summary | \
++		$(TOPDIR)/scripts/prepare-dm-verity-uboot-script.sh \
++		"$(HASHED_BOOT_DEVICE)" \
++		"$(BASIC_KERNEL_CMDLINE)" \
++		> $(KDIR)/$(DEVICE_NAME)-u-boot-script
++endef
++
++# build fw-ar-ver
++get_fw_ar_ver = \
++  $(if $(wildcard $(2)),$(shell rm -rf $(2))) \
++  $(if $(wildcard $(1)),$(info $(shell $(STAGING_DIR_HOST)/bin/ar-tool fw_ar_table create_ar_conf $(1) $(2)))) \
++  $(if $(wildcard $(2)),$(eval include $(2))) \
++  $(if $(FW_AR_VER),$(info FW_AR_VER = $(FW_AR_VER)))
++
++define Build/fw-ar-ver
++	$(call get_fw_ar_ver,$(ANTI_ROLLBACK_TABLE),$(AUTO_AR_CONF))
++endef
++
++# build signed fit
++define Build/fit-sign
++	$(TOPDIR)/scripts/mkits.sh \
++		-D $(DEVICE_NAME) \
++		-o $@.its \
++		-k $@ \
++		$(if $(word 2,$(1)),-d $(word 2,$(1))) -C $(word 1,$(1)) \
++		-a $(KERNEL_LOADADDR) \
++		-e $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
++		-c $(if $(DEVICE_DTS_CONFIG),$(DEVICE_DTS_CONFIG),"config-1") \
++		-A $(LINUX_KARCH) \
++		-v $(LINUX_VERSION) \
++		-s $(KDIR)/$(DEVICE_NAME)-u-boot-script \
++		$(if $(FIT_KEY_NAME),-S $(FIT_KEY_NAME)) \
++		$(if $(FW_AR_VER),-r $(FW_AR_VER))
++	PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage \
++		-f $@.its \
++		$(if $(FIT_KEY_DIR),-k $(FIT_KEY_DIR)) \
++		-r \
++		$@.new
++	@mv $@.new $@
++endef
++
+ # default all platform image(fit) build 
+ define Device/Default
+   PROFILES = Default $$(DEVICE_NAME)
+@@ -29,6 +78,8 @@ define Device/Default
+   IMAGES := sysupgrade.bin
+   IMAGE/sysupgrade.bin := append-kernel | pad-to 128k | append-rootfs | \
+ 	pad-rootfs | append-metadata
++  FIT_KEY_DIR :=
++  FIT_KEY_NAME :=
+ endef
+ 
+ include $(SUBTARGET).mk