[U-Boot] what is Flash Address Table why we can use(Board/---/flash.c)?

Hai sir,

I am using S29JL064H Spansion FLASH Memory, In this case 4 Banks used. For U-Boot i am taken OCOTEA Reference Board i am taken only 3 banks initialized in (Board/ocotea/flash.c) flash.c file Flash Address table why we are using and same addresses for starting thing