From 4dc4bfff9a2b57fa5b7d0ea1632f561498b65c24 Mon Sep 17 00:00:00 2001
From: Jammu Kekkonen <jammu.kekkonen@arm.com>
Date: Thu, 19 Sep 2019 11:38:27 +0300
Subject: [PATCH] Add option to use CCMRAM on F303xE.

---
 .../device/TOOLCHAIN_ARM_STD/stm32f303xe.sct               | 6 +++++-
 .../device/TOOLCHAIN_GCC_ARM/STM32F303XE.ld                | 7 +++++++
 .../device/TOOLCHAIN_IAR/stm32f303xe.icf                   | 2 ++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_ARM_STD/stm32f303xe.sct b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_ARM_STD/stm32f303xe.sct
index c1412b409f..02373d988f 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_ARM_STD/stm32f303xe.sct
+++ b/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)
+  }
 }
 
diff --git a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_GCC_ARM/STM32F303XE.ld b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_GCC_ARM/STM32F303XE.ld
index 5e5c2921cd..9bc823eb91 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_GCC_ARM/STM32F303XE.ld
+++ b/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
 }
 
diff --git a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_IAR/stm32f303xe.icf b/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_IAR/stm32f303xe.icf
index bce5012ece..87bc0bfa92 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE/device/TOOLCHAIN_IAR/stm32f303xe.icf
+++ b/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 };