from spi.h:20
struct flash_device
{
const char *name;
uint8_t read_cmd;
uint8_t qread_cmd;
uint8_t pprog_cmd;
uint8_t erase_cmd;
uint8_t chip_erase_cmd;
uint32_t device_id;
uint32_t pagesize;
uint32_t sectorsize;
uint32_t size_in_bytes;
};