Merge pull request ARMmbed#78 from linlingao/manage_bootloader

changed gcc linker script to workaround an issue in managed bootloade…

Author: linlingao

features/FEATURE_BOOTLOADER/targets/TARGET_TI/TARGET_CC32XX/TARGET_CC3220SF/mbed-bootloader-internal.bin

@@ -0,0 +1,10 @@
+{
+    "name": "bootloader_CC3220SF",
+    "target_overrides": {
+        "*": {
+            "target.app_offset": "0x8400",
+            "target.header_offset": "0x8000",
+            "target.bootloader_img": "mbed-bootloader-internal.bin"
+        }
+    }
+}

features/FEATURE_BOOTLOADER/targets/TARGET_TI/TARGET_CC32XX/TARGET_CC3220SF/mbed_lib.json

@@ -8,23 +8,53 @@
 #define RAM_SIZE        0x40000
 #define VECTORS         195   /* This value must match NVIC_NUM_VECTORS */
 
-/* Common - Do not change */
-
-#if !defined(MBED_APP_START)
-  #define MBED_APP_START (ROM_START + FLASH_HDR_SIZE)
-#endif
-
-#if !defined(MBED_APP_SIZE)
-  #define MBED_APP_SIZE (ROM_SIZE - FLASH_HDR_SIZE)
-#endif
-
 /* Round up VECTORS_SIZE to 8 bytes */
 #define VECTORS_SIZE (((VECTORS * 4) + 7) & 0xFFFFFFF8)
 
+#if defined(MBED_APP_START)
+    /* 
+     * There're two cases if MBED_APP_START is defined.
+     * Case 1: MBED_APP_START is defined as ROM_START, this happens when restrict_size is turned on, most likely for bootloader build.
+     *         In this build, include FLASH_HDR region.
+     */
+    #define FLASH_HDR_INCLUDED 1
+
+    #if MBED_APP_START == ROM_START
+        #if defined(MBED_APP_SIZE)
+            #define ROM_EXEC_START  (ROM_START + FLASH_HDR_SIZE)
+            #define ROM_EXEC_SIZE (MBED_APP_SIZE - FLASH_HDR_SIZE)
+        #endif
+    #else
+    /*
+     * Case 2: MBED_APP_START is defined as a value greater than ROM_START, this is most likely a build other than the bootloader. E.g., the MCC build.
+     *         In this build, exclude FLASH_HDR region. This workarounds an issue in managed boodloader MCC build where the jump address and stack pointer point to the cookie area
+     */
+        #define FLASH_HDR_INCLUDED 0
+        #define ROM_EXEC_START  MBED_APP_START
+        #if defined(MBED_APP_SIZE)
+            #define ROM_EXEC_SIZE MBED_APP_SIZE
+        #else
+            #define ROM_EXEC_SIZE (ROM_SIZE- (MBED_APP_START - ROM_START)
+        #endif
+     #endif
+#else
+    /* 
+     * MBED_APP_START is not defined. This is most likely a bootloader build, or other apps that do not require boodloader.
+     * In this build, include FLASH_HDR region
+     */
+     #define FLASH_HDR_INCLUDED 1
+     #define ROM_EXEC_START (ROM_START + FLASH_HDR_SIZE)
+     #if defined(MBED_APP_SIZE)
+         #define ROM_EXEC_SIZE (MBED_APP_SIZE - FLASH_HDR_SIZE)
+     #else
+         #define ROM_EXEC_SIZE (ROM_SIZE - FLASH_HDR_SIZE)
+     #endif
+#endif
+
 MEMORY
 {
-    FLASH_HDR (rx) : ORIGIN = ROM_START, LENGTH = 0x800
-    FLASH (rx)     : ORIGIN = MBED_APP_START, LENGTH = MBED_APP_SIZE
+    FLASH_HDR (rx) : ORIGIN = FLASH_HDR_START, LENGTH = FLASH_HDR_SIZE
+    FLASH (rx)     : ORIGIN = ROM_EXEC_START, LENGTH = ROM_EXEC_SIZE
     RAM (rwx)      : ORIGIN = RAM_START + VECTORS_SIZE, LENGTH = RAM_SIZE - VECTORS_SIZE
 }
 
@@ -58,10 +88,11 @@ ENTRY(Reset_Handler)
 
 SECTIONS
 {
+#if FLASH_HDR_INCLUDED == 1
     .dbghdr : ALIGN (2048) {
         KEEP (*(.dbghdr))
     } > FLASH_HDR
-
+#endif
     .text :
     {
         KEEP(*(.isr_vector))