Introduce CONFIG_FIT_EXTERNAL_OFFSET

Introduce CONFIG_FIT_EXTERNAL_OFFSET to give user a choice to choose
where to put the external data.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

Kconfig

@@ -249,6 +249,16 @@ config FIT
 
 if FIT
 
+config FIT_EXTERNAL_OFFSET
+	hex "Text Base"
+	default 0x0
+	help
+	  This specifies a data offset in fit image.
+	  The offset is from data payload offset to the beginning of
+	  fit image header. When specifies a offset, specific data
+	  could be put in the hole between data payload and fit image
+	  header, such as CSF data on i.MX platform.
+
 config FIT_ENABLE_SHA256_SUPPORT
 	bool "Support SHA256 checksum of FIT image contents"
 	default y

Makefile

@@ -894,7 +894,7 @@ cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
 	>$(MKIMAGEOUTPUT) $(if $(KBUILD_VERBOSE:0=), && cat $(MKIMAGEOUTPUT))
 
 quiet_cmd_mkfitimage = MKIMAGE $@
-cmd_mkfitimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -f $(U_BOOT_ITS) -E $@ \
+cmd_mkfitimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -f $(U_BOOT_ITS) -E $@ -p $(CONFIG_FIT_EXTERNAL_OFFSET)\
 	>$(MKIMAGEOUTPUT) $(if $(KBUILD_VERBOSE:0=), && cat $(MKIMAGEOUTPUT))
 
 quiet_cmd_cat = CAT     $@