diff --git a/lib/romlib/Makefile b/lib/romlib/Makefile
index 00dde31..0e5d447 100644
--- a/lib/romlib/Makefile
+++ b/lib/romlib/Makefile
@@ -60,11 +60,16 @@
 
 $(LIB_DIR)/libwrappers.a: jmptbl.i $(WRAPPER_DIR)/jmpvar.o
 	@echo "  AR      $@"
-	$(Q)./genwrappers.sh -b $(WRAPPER_DIR) -o $@ jmptbl.i
+	$(Q)./genwrappers.sh -b $(WRAPPER_DIR) -o $@ $(BUILD_DIR)/jmptbl.i
 
 $(BUILD_DIR)/jmptbl.s: jmptbl.i
 	@echo "  TBL     $@"
-	$(Q)./gentbl.sh -o $@ jmptbl.i
+	if [ -e "../../$(PLAT_DIR)/jmptbl.i" ] ; \
+	then \
+		$(Q)./gentbl.sh -o $@ -b $(BUILD_DIR) ../../$(PLAT_DIR)/jmptbl.i; \
+	else \
+		@echo "USE_ROMLIB=1 requires jump table list file: jmptbl.i in platform directory"; \
+	fi
 
 clean:
 	@rm -f $(BUILD_DIR)/*
diff --git a/lib/romlib/gentbl.sh b/lib/romlib/gentbl.sh
index 0695f6e..e64cfe2 100755
--- a/lib/romlib/gentbl.sh
+++ b/lib/romlib/gentbl.sh
@@ -6,6 +6,7 @@
 set -e
 
 output=jmptbl.s
+build=.
 
 for i
 do
@@ -14,27 +15,45 @@
 		output=$2
 		shift 2
 		;;
+	-b)
+		build=$2
+		shift 2
+		;;
 	--)
 		shift
 		break
 		;;
 	-*)
-		echo usage: gentbl.sh [-o output]  file ... >&2
+		echo usage: gentbl.sh [-o output] [-b dir] file ... >&2
 		exit 1
 		;;
 	esac
 done
 
 tmp=`mktemp`
-trap "rm -f $tmp" EXIT INT QUIT
-
+trap "rm -f $$.tmp" EXIT INT QUIT
 rm -f $output
 
+# Pre-process include files
+awk '!/^$/ && !/[:blank:]*#.*/{
+if (NF == 2 && $1 == "include") {
+	while ((getline line < $2) > 0)
+		if (line !~ /^$/ && line !~ /[:blank:]*#.*/)
+			print line
+		close($2)
+} else
+	print
+}' "$@" |
+awk -v OFS="\t" '
+BEGIN{print "#index\tlib\tfunction\t[patch]"}
+{print NR-1, $0}' | tee $build/jmptbl.i |
 awk -v OFS="\n" '
 BEGIN {print "\t.text",
              "\t.globl\tjmptbl",
              "jmptbl:"}
       {sub(/[:blank:]*#.*/,"")}
-!/^$/ {print "\tb\t" $3}' "$@" > $tmp
-
-mv $tmp $output
+!/^$/ {if ($3 == "reserved")
+		print "\t.word\t0x0"
+	else
+		print "\tb\t" $3}' > $$.tmp &&
+mv $$.tmp $output
diff --git a/lib/romlib/genwrappers.sh b/lib/romlib/genwrappers.sh
index 48ee5a4..746e4ba 100755
--- a/lib/romlib/genwrappers.sh
+++ b/lib/romlib/genwrappers.sh
@@ -31,7 +31,7 @@
 done
 
 awk  '{sub(/[:blank:]*#.*/,"")}
-!/^$/ && !/\\tpatch$/ {print $1*4, $2, $3}' "$@" |
+!/^$/ && !/\\tpatch$/ !/\\treserved$/ {print $1*4, $2, $3}' "$@" |
 while read idx lib sym
 do
 	file=$build/${lib}_$sym
diff --git a/lib/romlib/jmptbl.i b/lib/romlib/jmptbl.i
index 5eca5aa..a7280d0 100644
--- a/lib/romlib/jmptbl.i
+++ b/lib/romlib/jmptbl.i
@@ -4,37 +4,40 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 # Format:
-# index	lib	function	[patch]
+# lib	function	[patch]
 # Add "patch" at the end of the line to patch a function. For example:
-# 14	mbedtls	mbedtls_memory_buffer_alloc_init	patch
+# mbedtls	mbedtls_memory_buffer_alloc_init	patch
+# Holes can be introduced in the table by using a special keyword "reserved".
+# Example:
+# reserved	reserved
+# The jump table will contain an invalid instruction instead of branch
 
-0	rom	rom_lib_init
-1	fdt	fdt_getprop_namelen
-2	fdt	fdt_setprop_inplace
-3	fdt	fdt_check_header
-4	fdt	fdt_node_offset_by_compatible
-5	mbedtls	mbedtls_asn1_get_alg
-6	mbedtls	mbedtls_asn1_get_alg_null
-7	mbedtls	mbedtls_asn1_get_bitstring_null
-8	mbedtls	mbedtls_asn1_get_bool
-9	mbedtls	mbedtls_asn1_get_int
-10	mbedtls	mbedtls_asn1_get_tag
-11	mbedtls	mbedtls_free
-12	mbedtls	mbedtls_md
-13	mbedtls	mbedtls_md_get_size
-14	mbedtls	mbedtls_memory_buffer_alloc_init
-15	mbedtls	mbedtls_oid_get_md_alg
-16	mbedtls	mbedtls_oid_get_numeric_string
-17	mbedtls	mbedtls_oid_get_pk_alg
-18	mbedtls	mbedtls_oid_get_sig_alg
-19	mbedtls	mbedtls_pk_free
-20	mbedtls	mbedtls_pk_init
-21	mbedtls	mbedtls_pk_parse_subpubkey
-22	mbedtls	mbedtls_pk_verify_ext
-23	mbedtls	mbedtls_platform_set_calloc_free
-24	mbedtls	mbedtls_platform_set_snprintf
-25	mbedtls	mbedtls_x509_get_rsassa_pss_params
-26	mbedtls	mbedtls_x509_get_sig_alg
-27	mbedtls	mbedtls_md_info_from_type
-28	c	exit
-29	c	atexit
\ No newline at end of file
+rom	rom_lib_init
+fdt	fdt_getprop_namelen
+fdt	fdt_setprop_inplace
+fdt	fdt_check_header
+fdt	fdt_node_offset_by_compatible
+mbedtls	mbedtls_asn1_get_alg
+mbedtls	mbedtls_asn1_get_alg_null
+mbedtls	mbedtls_asn1_get_bitstring_null
+mbedtls	mbedtls_asn1_get_bool
+mbedtls	mbedtls_asn1_get_int
+mbedtls	mbedtls_asn1_get_tag
+mbedtls	mbedtls_free
+mbedtls	mbedtls_md
+mbedtls	mbedtls_md_get_size
+mbedtls	mbedtls_memory_buffer_alloc_init
+mbedtls	mbedtls_oid_get_md_alg
+mbedtls	mbedtls_oid_get_numeric_string
+mbedtls	mbedtls_oid_get_pk_alg
+mbedtls	mbedtls_oid_get_sig_alg
+mbedtls	mbedtls_pk_free
+mbedtls	mbedtls_pk_init
+mbedtls	mbedtls_pk_parse_subpubkey
+mbedtls	mbedtls_pk_verify_ext
+mbedtls	mbedtls_platform_set_snprintf
+mbedtls	mbedtls_x509_get_rsassa_pss_params
+mbedtls	mbedtls_x509_get_sig_alg
+mbedtls	mbedtls_md_info_from_type
+c	exit
+c	atexit