如何实现开机自动检测T卡是否存在并将彩信存储到T卡

1. MMI_MMS_STORAGE_IN_CARD_PREFER 
 
2. srv_mms_read_nvram_settingsTT 
#ifdef __MMI_MMS_MEMORY_CARD_STORAGE_SUPPORT__ 
#ifdef MMI_MMS_STORAGE_IN_CARD_PREFER 
 if(mmi_fmgr_is_drive_accessible((S8)MMI_CARD_DRV)) 
  { 
   nvram_mms_prefer_storage = E_PREFER_STORAGE_MODE_CARD; 
  } 
  
 else 
#else 
  { 
   ReadValue(NVRAM_SETTING_PREFER_MMS_STORAGE_MODE, &nvram_mms_prefer_storage, DS_BYTE,
&error); 
  } 
  
#endif 
  
    if (nvram_mms_prefer_storage == 0xFF) 
    { 
        nvram_mms_prefer_storage = E_PREFER_STORAGE_MODE_PHONE; 
    } 
#endif /* __MMI_MMS_MEMORY_CARD_STORAGE_SUPPORT__ */
3. T 
mmsInterfaceSrv.c 
void srv_mms_reset_prefer_storage_card() 
{ 
 nvram_mms_prefer_storage = E_PREFER_STORAGE_MODE_CARD; 
 return; 
}
void srv_mms_reset_prefer_storage_phone() 
{ 
 nvram_mms_prefer_storage = E_PREFER_STORAGE_MODE_PHONE; 
 return; 
}
fmgr_main_msdc_plug_out_hdlrfmgr_main_msdc_plug_in_hdlrT 
 //fmgr_main_msdc_plug_out_hdlr 
 if (mms_is_ready()) 
 { 
  srv_mms_reset_prefer_storage_phone(); 
  mmi_umms_app_dtmgr_send_set_settings_to_service();   
 }
//fmgr_main_msdc_plug_in_hdlr 
 if (mms_is_ready()) 
 { 
  srv_mms_reset_prefer_storage_ card (); 
  mmi_umms_app_dtmgr_send_set_settings_to_service();   
 }