[ECOS] the problem about the file system

[ness <ness@zh.t2-design.com>]

    Hi, all.
    I downloaded the "fileio" and "RAM filesystem" via the CVS.  I compiled them and builded the tests. And I run them on the mips,it is OK. Then I ported the another RAM filesystem (I writted) like FAT. The  compiling and building tests are all right.But I meet the problem when the program is running.I used the GDB to find why.
The process of running is :
It goes to "cyg_hal_invoke_constructors" .

		void
 		cyg_hal_invoke_constructors(void)
	        {
		    pfunc *p;
 		
		    for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
		        (*p) ();
 		#endif
 		    
		} // cyg_hal_invoke_constructors()
 		
     In the circle it first invokes some initial functions about interruption etc. ,
Then it invoked the "Cyg_Fileio_Init_Class()".

 		
 		Cyg_Fileio_Init_Class::Cyg_Fileio_Init_Class()
		{
		    cyg_fd_init();
		
		    cyg_mtab_init();
 		
		    chdir("/");
		}
 	
   After finishing the "Cyg_Fileio_Init_Class()",it invokes the two macro .

                  Cyg_Mutex mtab_lock[CYGNUM_FILEIO_MTAB_MAX];
                  Cyg_Mutex fstab_lock[CYGNUM_FILEIO_FSTAB_MAX];
 
    Then it goes back to the circle in the "cyg_hal_invoke_constructors".When it continues ,the GDB give the information :

               GDB is unable to find the start of the function at 0x80109598
           and thus can't determine the size of that function's stack frame.
           This means that GDB may be unable to access that stack frame, or
           the frames below it.
               This problem is most likely caused by an invalid program counter or
           stack pointer.
               However, if you think GDB should simply search farther back
           from 0x80109598 for code which looks like the beginning of a
           function, you can increase the range of the search using the `set
           heuristic-fence-post' command.

           Error: Remote communication error: Permission denied.
           putpkt: write failed: Permission denied.
           putpkt: write failed: Permission denied.

    I don't know why? Who can tell me why and how to resolve it?
    Many thinks.

                                                                          ness miao
                                                                          9,8