diff --git a/tools/mksymtab.sh b/tools/mksymtab.sh
index e72196791..4f1d7f481 100755
--- a/tools/mksymtab.sh
+++ b/tools/mksymtab.sh
@@ -21,7 +21,7 @@
 
 export LC_ALL=C
 
-usage="Usage: $0 <imagedirpath> [symtabprefix]"
+usage="Usage: $0 <imagedirpath> [symtabprefix [additionalsymbolspath]]"
 
 # Check for the required directory path
 
@@ -36,6 +36,7 @@ fi
 # Get the symbol table prefix
 
 prefix=$2
+add_sym=$3
 
 # Extract all of the undefined symbols from the ELF files and create a
 # list of sorted, unique undefined variable names.
@@ -59,6 +60,18 @@ if [ -z "$varlist" ]; then
   fi
 fi
 
+if [ "x$add_sym" != "x" ]; then
+  if [ -f $add_sym ]; then
+    varlist="${varlist}\n$(cat $add_sym)"
+  elif [ -d $add_sym ]; then
+    varlist="${varlist}\n$(find $add_sym -type f | xargs cat)"
+  else
+    echo $usage
+    exit 1
+  fi
+  varlist=$(echo -e "${varlist}" | sort -u)
+fi
+
 # Now output the symbol table as a structure in a C source file.  All
 # undefined symbols are declared as void* types.  If the toolchain does
 # any kind of checking for function vs. data objects, then this could