Enable SPI and a Gpio as output(CS pin).Connect WP and HOLD to VCC.
Select software CS pin.
After init, you can watch
w25qxx struct.(Chip ID,page size,sector size and ...)
In Read/Write Function, you can put 0 to
NumByteToRead/NumByteToWrite parameter to maximum.
Dont forget to erase page/sector/block before write.