Ensure CRP is set correctly for IAR, GCC and ARM

CRP value can be set through a macro in mbed_app such as
"macros": [
    "CRP=CRP_NONE"
]

Author: chrissnow

targets/TARGET_NXP/TARGET_LPC176X/device/CRP.c

@@ -13,6 +13,48 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#if !defined(MBED_APP_START) // do not include CRP if there is a bootloader.
-    long CRP_Key __attribute__((section(".ARM.__at_0x000002FC "))) = 0xFFFFFFFF;
+ 
+ #include "mbed_toolchain.h"
+
+ /* Code Read Protection
+
+NONE	0xFFFFFFFF - No code protection.
+
+CRP1    0x12345678 - Write to RAM command can not access RAM below 0x10000200.
+                   - Read Memory command: disabled.
+                   - Copy RAM to Flash command: cannot write to Sector 0.
+                   - "Go" command: disabled.
+                   - Erase sector(s) command: can erase any individual sector except 
+                   	 sector 0 only, or can erase all sectors at once.
+                   - Compare command: disabled
+
+CRP2    0x87654321 - Write to RAM command: disabled.
+                   - Copy RAM to Flash: disabled.
+                   - Erase command: only allows erase of all sectors.
+
+CRP3    0x43218765 - Access to chip via the SWD pins is disabled. ISP entry
+                     by pulling PIO0_1 LOW is disabled if a valid user code is
+                     present in flash sector 0.
+Caution: If CRP3 is selected, no future factory testing can be
+performed on the device.
+*/
+#if !defined(APPLICATION_ADDR) // Relocate CRP if there is a bootloader.
+    #define APPLICATION_ADDR 0
+#endif
+
+#define CRP_NONE	0xFFFFFFFF
+#define CRP_1		0x12345678 
+#define CRP_2		0x87654321
+#define CRP_3		0x43218765
+
+#ifndef CRP
+#define CRP CRP_NONE
+#endif
+
+#if defined (__ICCARM__)
+    __root const long CRP_Key@APPLICATION_ADDR + 0x000002FC = CRP;
+#elif defined (__ARMCC_VERSION)
+    const long CRP_Key __attribute__((used)) __attribute__((at(APPLICATION_ADDR+0x000002FC))) = CRP;
+#elif defined (__GNUC__)
+    const long CRP_Key __attribute__((used)) __attribute__((section(".CRPSection"))) = CRP;
 #endif

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_ARM_MICRO/startup_LPC17xx.S

@@ -99,12 +99,6 @@ __Vectors       DCD     __initial_sp              ; Top of Stack
                 DCD     PLL1_IRQHandler           ; 48: PLL1 Lock (USB PLL)
 
 
-                IF      :LNOT::DEF:NO_CRP
-                AREA    |.ARM.__at_0x02FC|, CODE, READONLY
-CRP_Key         DCD     0xFFFFFFFF
-                ENDIF
-
-
                 AREA    |.text|, CODE, READONLY
 
 

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_ARM/LPC1768.ld

@@ -49,6 +49,10 @@ SECTIONS
     .text :
     {
         KEEP(*(.isr_vector))
+        /* Code Read Protect data */
+        . = 0x000002FC ;
+        KEEP(*(.CRPSection))
+        /* End of Code Read Protect */
         *(.text*)
 
         KEEP(*(.init))
@@ -71,6 +75,8 @@ SECTIONS
         *(.rodata*)
 
         KEEP(*(.eh_frame*))
+		
+		
     } > FLASH
 
     .ARM.extab : 

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_IAR/startup_LPC17xx.S

@@ -350,26 +350,4 @@ USBActivity_IRQHandler
 CANActivity_IRQHandler
         B CANActivity_IRQHandler
 
-#ifndef SRAM
-        SECTION .crp:CODE:ROOT(2)
-        DATA
-/* Code Read Protection
-CRP1    0x12345678 - Write to RAM command can not access RAM below 0x10000200.
-                   - Read Memory command: disabled.
-                   - Copy RAM to Flash command: cannot write to Sector 0.
-                   - "Go" command: disabled.
-                   - Erase sector(s) command: can erase any individual sector except 
-                   	 sector 0 only, or can erase all sectors at once.
-                   - Compare command: disabled
-CRP2    0x87654321 - Write to RAM command: disabled.
-                   - Copy RAM to Flash: disabled.
-                   - Erase command: only allows erase of all sectors.
-CRP3    0x43218765 - Access to chip via the SWD pins is disabled. ISP entry
-                     by pulling PIO0_1 LOW is disabled if a valid user code is
-                     present in flash sector 0.
-Caution: If CRP3 is selected, no future factory testing can be
-performed on the device.
-*/
-	DCD	0xFFFFFFFF
-#endif
         END