help me please!!! alt_flash_open_dev return error

I use sst flash 39vf6401 on my borad.When I need to progamme the flash, I should add a CFI table .Then I can download the programme to the flash successfully.

But I can not open the flash while alt_flash_open_dev(). The return value of alt_flash_open_dev() is always wrong.

If any one know something about it, please help me ,Thank you !