Add crash RAM to STM32F412xG

targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F412xG/TOOLCHAIN_GCC_ARM/STM32F412xG.ld

@@ -35,6 +35,8 @@
 /* Round up VECTORS_SIZE to 8 bytes */
 #define VECTORS_SIZE  (((NVIC_NUM_VECTORS * 4) + 7) & 0xFFFFFFF8)
 
+M_CRASH_DATA_RAM_SIZE = 0x100;
+
 MEMORY
 {
     FLASH (rx)   : ORIGIN = MBED_APP_START, LENGTH = MBED_APP_SIZE
@@ -114,6 +116,18 @@ SECTIONS
     __etext = .;
     _sidata = .;
     
+    .crash_data_ram :
+    {
+        . = ALIGN(8);
+        __CRASH_DATA_RAM__ = .;
+        __CRASH_DATA_RAM_START__ = .; /* Create a global symbol at data start */
+        KEEP(*(.keep.crash_data_ram))
+        *(.m_crash_data_ram)     /* This is a user defined section */
+        . += M_CRASH_DATA_RAM_SIZE;
+        . = ALIGN(8);
+        __CRASH_DATA_RAM_END__ = .; /* Define a global symbol at data end */
+    } > RAM    
+
     .data : AT (__etext)
     {
         __data_start__ = .;