diff --git a/targets/targets.json b/targets/targets.json
index 0d7e0a913a..db7b12da51 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -2364,6 +2364,32 @@
         "inherits": ["Target"],
         "core": "Cortex-M3",
         "extra_labels": ["ONSEMI"],
+        "config": {
+            "mac-addr-low": {
+                "help": "Lower 32 bits of the MAC extended address",
+                "value": "0x12345678"
+            },
+            "mac-addr-high": {
+                "help": "Higher 32 bits of the MAC extended address",
+                "value": "0xACDE4800"
+            },
+            "32KHz-clk-trim": {
+                "help": "32KHz clock trim",
+                "value": "0x3A"
+            },
+            "32MHz-clk-trim": {
+                "help": "32MHz clock trim",
+                "value": "0x16"
+            },
+            "rssi-trim": {
+                "help": "RSSI trim",
+                "value": "0x3D"
+            },
+            "txtune-trim": {
+                "help": "TX tune trim",
+                "value": "0x12"
+            }
+        },
         "post_binary_hook": {"function": "NCS36510TargetCode.ncs36510_addfib"},
         "macros": ["CM3", "CPU_NCS36510", "TARGET_NCS36510", "LOAD_ADDRESS=0x3000"],
         "supported_toolchains": ["GCC_ARM", "ARM", "IAR"],
diff --git a/tools/add_fib.py b/tools/add_fib.py
index 173ca0544b..f884a118c5 100644
--- a/tools/add_fib.py
+++ b/tools/add_fib.py
@@ -15,8 +15,7 @@ from __future__ import print_function
 import itertools
 import binascii
 import intelhex
-import json
-
+from tools.config import Config
 
 FIB_BASE = 0x2000
 FLASH_BASE = 0x3000
@@ -155,21 +154,30 @@ def add_fib_at_start(arginput):
     for i in range(fib_start + dummy_fib_size + fib_size, trim_area_start):
         output_hex_file[i] = 0xFF
 
-    # add trim data from json
-    with open('./mbed-os/targets/TARGET_ONSEMI/TARGET_NCS36510/ncs36510_user_trim.json') as json_data:
-        trimdata = json.load(json_data)
-        mac_addr_low = int(trimdata["mac-addr-low"], 16)
-        mac_addr_high = int(trimdata["mac-addr-high"], 16)
-        clk_32k_trim = int(trimdata["32KHz-clk-trim"], 16)
-        clk_32m_trim = int(trimdata["32MHz-clk-trim"], 16)
-        rssi_trim = int(trimdata["rssi-trim"], 16)
-        txtune = int(trimdata["txtune-trim"], 16)
+    # Read in configuration data from the config parameter in targets.json
+    configData = Config('NCS36510')
+    paramData = configData.get_target_config_data()
+    for v in paramData.values():
+        if (v.name == "target.mac-addr-high"):
+            mac_addr_high = int(v.value, 16)
+        elif (v.name == "target.mac-addr-low"):
+            mac_addr_low = int(v.value,16)
+        elif (v.name == "target.32KHz-clk-trim"):
+            clk_32k_trim = int(v.value,16)
+        elif (v.name == "target.32MHz-clk-trim"):
+            clk_32m_trim = int(v.value,16)
+        elif (v.name == "target.rssi-trim"):
+            rssi = int(v.value,16)
+        elif (v.name == "target.txtune-trim"):
+            txtune = int(v.value,16)
+        else:
+            print("Not a valid param")
 
     output_hex_file[trim_area_start + 0] = mac_addr_low & 0xFF
     output_hex_file[trim_area_start + 1] = (mac_addr_low >> 8)  & 0xFF
     output_hex_file[trim_area_start + 2] = (mac_addr_low >> 16) & 0xFF
     output_hex_file[trim_area_start + 3] = (mac_addr_low >> 24) & 0xFF
-
+    
     output_hex_file[trim_area_start + 4] = mac_addr_high & 0xFF
     output_hex_file[trim_area_start + 5] = (mac_addr_high >> 8)  & 0xFF
     output_hex_file[trim_area_start + 6] = (mac_addr_high >> 16) & 0xFF
@@ -185,16 +193,16 @@ def add_fib_at_start(arginput):
     output_hex_file[trim_area_start + 14] = (clk_32m_trim >> 16) & 0xFF
     output_hex_file[trim_area_start + 15] = (clk_32m_trim >> 24) & 0xFF
 
-    output_hex_file[trim_area_start + 16] = rssi_trim & 0xFF
-    output_hex_file[trim_area_start + 17] = (rssi_trim >> 8)  & 0xFF
-    output_hex_file[trim_area_start + 18] = (rssi_trim >> 16) & 0xFF
-    output_hex_file[trim_area_start + 19] = (rssi_trim >> 24) & 0xFF
+    output_hex_file[trim_area_start + 16] = rssi & 0xFF
+    output_hex_file[trim_area_start + 17] = (rssi >> 8)  & 0xFF
+    output_hex_file[trim_area_start + 18] = (rssi >> 16) & 0xFF
+    output_hex_file[trim_area_start + 19] = (rssi >> 24) & 0xFF
 
     output_hex_file[trim_area_start + 20] = txtune & 0xFF
     output_hex_file[trim_area_start + 21] = (txtune >> 8)  & 0xFF
     output_hex_file[trim_area_start + 22] = (txtune >> 16) & 0xFF
     output_hex_file[trim_area_start + 23] = (txtune >> 24) & 0xFF
-
+    
     # pad the rest of the area with 0xFF
     for i in range(trim_area_start + trim_size, user_code_start):
         output_hex_file[i] = 0xFF