imx-common: compile plugin code

If CONFIG_USE_IMXIMG_PLUGIN is selected, plugin.bin will be
generated under board/$(BOARDDIR)/.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/imx-common/Makefile

@@ -38,6 +38,23 @@ obj-$(CONFIG_CMD_BMODE) += cmd_bmode.o
 obj-$(CONFIG_CMD_HDMIDETECT) += cmd_hdmidet.o
 obj-$(CONFIG_CMD_DEKBLOB) += cmd_dek.o
 
+PLUGIN = board/$(BOARDDIR)/plugin
+
+ifeq ($(CONFIG_USE_IMXIMG_PLUGIN),y)
+
+$(PLUGIN).o: $(PLUGIN).S FORCE
+	$(Q)mkdir -p $(dir $@)
+	$(call if_changed_dep,as_o_S)
+
+$(PLUGIN).bin: $(PLUGIN).o FORCE
+	$(Q)mkdir -p $(dir $@)
+	$(OBJCOPY) -O binary --gap-fill 0xff $< $@
+else
+
+$(PLUGIN).bin:
+
+endif
+
 quiet_cmd_cpp_cfg = CFGS    $@
       cmd_cpp_cfg = $(CPP) $(cpp_flags) -x c -o $@ $<
 
@@ -47,24 +64,24 @@ $(IMX_CONFIG): %.cfgtmp: % FORCE
 	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,cpp_cfg)
 
-MKIMAGEFLAGS_u-boot.imx = -n $(filter-out $< $(PHONY),$^) -T imximage \
+MKIMAGEFLAGS_u-boot.imx = -n $(filter-out $(PLUGIN).bin $< $(PHONY),$^) -T imximage \
 	-e $(CONFIG_SYS_TEXT_BASE)
 
-u-boot.imx: u-boot.bin $(IMX_CONFIG) FORCE
+u-boot.imx: u-boot.bin $(IMX_CONFIG) $(PLUGIN).bin FORCE
 	$(call if_changed,mkimage)
 
 ifeq ($(CONFIG_OF_SEPARATE),y)
-MKIMAGEFLAGS_u-boot-dtb.imx = -n $(filter-out $< $(PHONY),$^) -T imximage \
+MKIMAGEFLAGS_u-boot-dtb.imx = -n $(filter-out $(PLUGIN).bin $< $(PHONY),$^) -T imximage \
 	-e $(CONFIG_SYS_TEXT_BASE)
 
-u-boot-dtb.imx: u-boot-dtb.bin $(IMX_CONFIG) FORCE
+u-boot-dtb.imx: u-boot-dtb.bin $(IMX_CONFIG) $(PLUGIN).bin FORCE
 	$(call if_changed,mkimage)
 endif
 
-MKIMAGEFLAGS_SPL = -n $(filter-out $< $(PHONY),$^) -T imximage \
+MKIMAGEFLAGS_SPL = -n $(filter-out $(PLUGIN).bin $< $(PHONY),$^) -T imximage \
 	-e $(CONFIG_SPL_TEXT_BASE)
 
-SPL: spl/u-boot-spl.bin $(IMX_CONFIG) FORCE
+SPL: spl/u-boot-spl.bin $(IMX_CONFIG) $(PLUGIN).bin FORCE
 	$(call if_changed,mkimage)
 
 MKIMAGEFLAGS_u-boot.uim = -A arm -O U-Boot -a $(CONFIG_SYS_TEXT_BASE) \