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You can download our low level driver for parallel NOR flash from here - https://www.cypress.com/documentation/software-and-drivers/low-level-driver-nor-flash?source=search&cat=software_tools
Please note that S70GL02GS is a dual die stack of two S29GL01GS chips. Hence, the MSB bit of address should be taken care of for accessing the correct die. Please go through this Application Note for more information - Accessing the Second Die in S70GL02GS – KBA219687
Please let me know if you have any further queries.