Add some comments

Author: geekbozu

src/main.cpp

@@ -160,9 +160,12 @@ Pinetime::System::SystemTask systemTask(spi,
                                         heartRateApp,
                                         fs);
 
+/* Variable Declarations for variables in noinit SRAM 
+   Increment NoInit_MagicValue upon adding variables to this area
+*/
 extern uint32_t __start_noinit_data;
 extern uint32_t __stop_noinit_data;
-static constexpr uint32_t NoInit_MagicValue = 0xDEADBEEF;
+static constexpr uint32_t NoInit_MagicValue = 0xDEAD0000;
 uint32_t NoInit_MagicWord __attribute__((section(".noinit")));
 std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> NoInit_BackUpTime __attribute__((section(".noinit")));
 
@@ -327,10 +330,11 @@ int main(void) {
   // retrieve version stored by bootloader
   Pinetime::BootloaderVersion::SetVersion(NRF_TIMER2->CC[0]);
 
-  // Check Magic Ram and reset lost variables
+  
   if (NoInit_MagicWord == NoInit_MagicValue) {
     dateTimeController.SetCurrentTime(NoInit_BackUpTime);
   } else {
+    //Clear Memory to known state
     memset(&__start_noinit_data,0,(uintptr_t)&__stop_noinit_data-(uintptr_t)&__start_noinit_data);
     NoInit_MagicWord = NoInit_MagicValue;
   }