diff -drupN a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
--- a/drivers/rpmsg/Makefile	2018-08-06 17:23:04.000000000 +0300
+++ b/drivers/rpmsg/Makefile	2022-06-12 05:28:14.000000000 +0300
@@ -1,3 +1,4 @@
 obj-$(CONFIG_RPMSG)		+= rpmsg_core.o
 obj-$(CONFIG_RPMSG_QCOM_SMD)	+= qcom_smd.o
 obj-$(CONFIG_RPMSG_VIRTIO)	+= virtio_rpmsg_bus.o
+obj-$(CONFIG_SUNXI_MSGBOX)      += sunxi_msgbox.o