remvoe main as thread of cmsis rtx for portability.

Keil & lpcxpresso4 host_cmsis_rtx work well

vendor/cmsis_rtos_rtx/INC/RTX_CM_lib.h

@@ -115,6 +115,9 @@ _declare_box8 (mp_stk, OS_STKSIZE*4, OS_TASK_CNT-OS_PRIV_CNT+1);
 uint32_t const mp_stk_size = sizeof(mp_stk);
 
 /* Memory pool for user specified stack allocation (+main, +timer) */
+#ifdef __CODE_RED
+__attribute__ (( section(".data.$RAM2") )) // overflow RamLoc32
+#endif
 uint64_t       os_stack_mem[2+OS_PRIV_CNT+(OS_STACK_SZ/8)];
 uint32_t const os_stack_sz = sizeof(os_stack_mem);
 
@@ -234,6 +237,7 @@ __attribute__((used)) void _mutex_release (OS_ID *mutex) {
  *      RTX Startup
  *---------------------------------------------------------------------------*/
 
+#if osFeature_MainThread
 /* Main Thread definition */
 extern int main (void);
 osThreadDef_t os_thread_def_main = {(os_pthread)main, osPriorityNormal, 1, 4*OS_MAINSTKSIZE };
@@ -373,6 +377,8 @@ __noreturn __stackless void __cmain(void) {
 
 #endif
 
+#endif
+
 
 /*----------------------------------------------------------------------------
  * end of file

vendor/cmsis_rtos_rtx/INC/cmsis_os.h

@@ -141,7 +141,7 @@ used throughout the whole project.
 
 
 /// \note MUST REMAIN UNCHANGED: \b osFeature_xxx shall be consistent in every CMSIS-RTOS.
-#define osFeature_MainThread   1       ///< main thread      1=main can be thread, 0=not available
+#define osFeature_MainThread   0       ///< main thread      1=main can be thread, 0=not available
 #define osFeature_Pool         1       ///< Memory Pools:    1=available, 0=not available
 #define osFeature_MailQ        1       ///< Mail Queues:     1=available, 0=not available
 #define osFeature_MessageQ     1       ///< Message Queues:  1=available, 0=not available