Add about command to menu and restructure code. Delete preliminary code from mainloop. Better code will follow

stm-firmware/stm32f407vet6_flash.ld

@@ -112,13 +112,8 @@ SECTIONS
 
   _siccmram = LOADADDR(.ccmram);
 
-  /* CCM-RAM section 
-  * 
-  * IMPORTANT NOTE! 
-  * If initialized variables will be placed in this section, 
-  * the startup code needs to be modified to copy the init-values.  
-  */
-  .ccmram :
+  /* CCM-RAM section  */
+  .ccmram (NOLOAD):
   {
     . = ALIGN(4);
     _sccmram = .;       /* create a global symbol at ccmram start */
@@ -126,12 +121,12 @@ SECTIONS
     *(.ccmram*)
     . = ALIGN(4);
     _eccmram = .;       /* create a global symbol at ccmram end */
-  } >CCM AT> FLASH
+  } >CCM
 
  _sidata = LOADADDR(.data);
 
   /* Initialized data sections goes into RAM, load LMA copy after code */
-  .data : 
+ .data : 
   {
     . = ALIGN(4);
     _sdata = .;        /* create a global symbol at data start */