Merge pull request #11756 from JammuKekkonen/add_ccmram_section_for_f303re

Add option to use CCMRAM on F303xE.

Author: 0xc0170

targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_ARM_STD/stm32f303xe.sct

@@ -42,7 +42,7 @@
 
 #define Stack_Size MBED_BOOT_STACK_SIZE
 
-; STM32F303RE: 512KB FLASH (0x80000) + 64KB SRAM (0x10000)
+; STM32F303RE: 512KB FLASH (0x80000) + 64KB SRAM (0x10000) + 16KB CCMRAM (0x4000)
 LR_IROM1 MBED_APP_START MBED_APP_SIZE  {    ; load region size_region
 
   ER_IROM1 MBED_APP_START MBED_APP_SIZE  {  ; load address = execution address
@@ -58,5 +58,9 @@ LR_IROM1 MBED_APP_START MBED_APP_SIZE  {    ; load region size_region
 
   ARM_LIB_STACK (0x20000000+0x10000) EMPTY -Stack_Size { ; stack
   }
+
+  CCMRAM (0x10000000) (0x4000)  {
+   .ANY (CCMRAM)
+  }
 }
 

targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_GCC_ARM/STM32F303XE.ld

@@ -168,5 +168,12 @@ SECTIONS
 
     /* Check if data + heap + stack exceeds RAM limit */
     ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+
+    .CCMRAM (NOLOAD):
+    {
+        Image$$RW_IRAM2$$Base = . ;
+        *(CCMRAM)
+        Image$$RW_IRAM2$$ZI$$Limit = .;
+    } > CCM
 }
 

targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_IAR/stm32f303xe.icf

@@ -33,8 +33,10 @@ define block STACKHEAP with fixed order { block HEAP, block CSTACK };
 
 initialize by copy with packing = zeros { readwrite };
 do not initialize  { section .noinit };
+do not initialize  { section CCMRAM };
 
 place at address mem:__intvec_start__ { readonly section .intvec };
 
 place in ROM_region   { readonly };
 place in RAM_region   { readwrite, block STACKHEAP };
+place in CCMRAM_region    { section CCMRAM };