c++ - Vxworks sdOpen() errno: S_pgPoolLib_PAGES_NOT_ALLOCATED -

i trying read fpga registers user space application using vxworks function sdopen() (which create shared memory space). runned inside main function on vxworks 6.2 on arm-cortex a8. tried code still same error in title:

     sd_id sdid;       sdid =sdopen(     (char *)"iptest",      // name        : name of shared data region0,                                                                                                                                    0,                 //option     om_create,           // mode  : open mode = create if not exits     4*1024,            // size        : size of shared data in bytes     (off_t)0x25000000,          // physaddress : optional physical address     sd_attr_rw | sd_cache_off,      (void **)&pvirtaddress);  //  attr : allowed user mmu attribute               //pvirtaddress: optional virtual base address if(sdid == 0) {     switch(errno) {         case s_sdlib_virt_addr_ptr_is_null:                 printf("pvirtaddress null \n");                 break;         case s_sdlib_addr_not_aligned:                 printf("physaddress not aligned \n");                 break;         case s_sdlib_phys_addr_out_of_range:                 printf("physaddress exceeds physical address space \n");                 break;         case s_sdlib_size_is_null:                 printf("size null \n");                 break;         case s_sdlib_invalid_options:                 printf("options not valid combination \n");                 break;         case s_sdlib_virt_pages_not_available:                 printf("not enough virtual space left in system \n");                 break;         case s_sdlib_phys_pages_not_available:                 printf("not enough physical memory left in system \n");                 break;         default:                 printf("sdid null, , don't know problem\n");                 printf("errno = %d \n", errno);                 break;     } } if (pvirtaddress == null) {     std::cout<<"error timer : 'pvirtaddress = null' "<<std::endl; } 

appendice: * 0x25000000 fppga ip base address (avalon_mm bus mask: 0x25000000 + ip address : 0x00000400, cyclone iv), still "sdid null, , don't know problem" , errno 11862024 = s_pgpoollib_pages_not_allocated on vxworks ressource/tcl/ *pvirtaddress still null ps: physical addr = 0, worked

would appreciate help,