Move stack out of CCMRAM

Author: board707

STM32F4/boards.txt

@@ -236,7 +236,7 @@ generic_f407v.upload.maximum_data_size=131072
 
 generic_f407v.build.core=maple
 generic_f407v.build.f_cpu=168000000
-generic_f407v.build.extra_flags= -DCRYSTAL_FREQ=8 -DLED_BUILTIN=PA6 -DNO_CCMRAM
+generic_f407v.build.extra_flags= -DCRYSTAL_FREQ=8 -DLED_BUILTIN=PA6
 generic_f407v.build.variant=generic_f407v
 generic_f407v.build.variant_system_lib=lib_f407.a
 generic_f407v.build.error_led_pin=PA7

STM32F4/variants/generic_f407v/ld/common.inc

@@ -38,7 +38,7 @@ EXTERN(start_c)
 /* main entry point */
 EXTERN(main)
 
-/* Initial stack pointer value. Relocated to RAM */
+/* Initial stack pointer value. */
 EXTERN(__msp_init)
 PROVIDE(__msp_init = ORIGIN(ram) + LENGTH(ram));
 
@@ -140,6 +140,7 @@ SECTIONS
         . = ALIGN(4);
         _lm_rom_img_cfgp = .;
         LONG(LOADADDR(.data));
+        LONG(LOADADDR(.ccmdata));
         /*
          * Heap: Linker scripts may choose a custom heap by overriding
          * _lm_heap_start and _lm_heap_end. Otherwise, the heap is in
@@ -168,6 +169,23 @@ SECTIONS
         __data_end__ = .;
       } > REGION_DATA AT> REGION_RODATA
 
+    /* CCM-RAM section 
+    * 
+    * IMPORTANT NOTE! 
+    * The startup code is modified to copy the init-values from flash to ccmram 
+    * at startup
+    */
+    .ccmdata :
+      {
+        . = ALIGN(4);
+        __ccmdata_start__ = .;       /* create a global symbol at ccmram start */
+        *(.ccmdata)
+        *(.ccmram*)
+    
+        . = ALIGN(4);
+        __ccmdata_end__ = .;       /* create a global symbol at ccmram end */
+      } >REGION_CCMRAM AT> REGION_RODATA
+
     /*
      * .bss
      */

STM32F4/variants/generic_f407v/ld/jtag.ld

@@ -1,9 +1,11 @@
 /*
- * STM32F411 linker script for JTAG (bare metal, no bootloader) builds.
+ * STM32F4xx high density linker script for
+ * JTAG (bare metal, no bootloader) builds.
  */
 
 MEMORY
 {
+  ccmram (rw): ORIGIN = 0x10000000, LENGTH = 64K
   ram (rwx)  : ORIGIN = 0x20000000, LENGTH = 128K
   rom (rx)   : ORIGIN = 0x08000000, LENGTH = 512K
 }
@@ -14,6 +16,7 @@ REGION_ALIAS("REGION_TEXT", rom);
 REGION_ALIAS("REGION_DATA", ram);
 REGION_ALIAS("REGION_BSS", ram);
 REGION_ALIAS("REGION_RODATA", rom);
+REGION_ALIAS("REGION_CCMRAM", ccmram);
 
 _FLASH_BUILD = 1;
 INCLUDE common.inc