So board layout has is as DNP… Do Not Populate.
I added the chip to the flashDevice.h file and the Base file too.(attached files)
It compiles but no chip is Identified. I’ll break out the scope and check the CS,
Any advice on which SPI lib works the best. SPIMemory.h or, adafruit_SPIflash.h
Too bad no examples exist on the wiki, the W25Q80DV: 8M-bit/1M-byte (1,048,576) Flash memory with current consumption as low as 1µA for power-down. ADDS a big BUMP in space for Grove ready projects. Who needs an SD card. 
HTH
GL 
PJ
flash_devices&SPIFlashBase.zip (7.8 KB)