diff --git a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/TOOLCHAIN_GCC_ARM/STM32F334X8.ld b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/TOOLCHAIN_GCC_ARM/STM32F334X8.ld
index 5f479936c8..71b3e1eb1b 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/TOOLCHAIN_GCC_ARM/STM32F334X8.ld
+++ b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/TOOLCHAIN_GCC_ARM/STM32F334X8.ld
@@ -38,6 +38,7 @@
 MEMORY
 {
     FLASH (rx)   : ORIGIN = MBED_APP_START, LENGTH = MBED_APP_SIZE
+    CCMRAM (rw)  : ORIGIN = 0x10000000, LENGTH = 4K
     RAM (rwx)    : ORIGIN = MBED_RAM_START + VECTORS_SIZE, LENGTH = MBED_RAM_SIZE - VECTORS_SIZE
 }
 
@@ -113,7 +114,7 @@ SECTIONS
 
     __etext = .;
     _sidata = .;
-    
+
     .data : AT (__etext)
     {
         __data_start__ = .;
@@ -161,7 +162,7 @@ SECTIONS
         . = ALIGN(32);
         __uninitialized_end = .;
     } > RAM
-    
+
     .bss :
     {
         . = ALIGN(8);
diff --git a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/cmsis_nvic.h b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/cmsis_nvic.h
index 78d4dd08b2..ba4a9d1b38 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/cmsis_nvic.h
+++ b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F334x8/cmsis_nvic.h
@@ -30,7 +30,9 @@
 #endif
 
 #if !defined(MBED_RAM_SIZE)
-#define MBED_RAM_SIZE  0x4000  // 16 KB
+// 0x20000000 - 0x20002FFF 12K SRAM
+// 0x10000000 - 0x20000FFF  4K CCM SRAM
+#define MBED_RAM_SIZE  0x3000  // 12 KB
 #endif
 
 #define NVIC_NUM_VECTORS        98
diff --git a/tools/arm_pack_manager/index.json b/tools/arm_pack_manager/index.json
index ae55d0e6c4..79cf920c56 100644
--- a/tools/arm_pack_manager/index.json
+++ b/tools/arm_pack_manager/index.json
@@ -370153,7 +370153,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370233,7 +370233,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370313,7 +370313,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370393,7 +370393,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370473,7 +370473,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370633,7 +370633,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370713,7 +370713,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370793,7 +370793,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370873,7 +370873,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -370953,7 +370953,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             }, 
@@ -371033,7 +371033,7 @@
                     "write": true
                 }, 
                 "default": true, 
-                "size": 16384, 
+                "size": 12288,
                 "start": 536870912, 
                 "startup": false
             },