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qmk_firmware/flash_driver.md

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FLASH Driver Configuration :id=flash-driver-configuration

The FLASH driver can be swapped out depending on the needs of the keyboard, or whether extra hardware is present.

Driver Description
FLASH_DRIVER = spi Supports writing to almost all NOR Flash chips. See the driver section below.

SPI FLASH Driver Configuration :id=spi-flash-driver-configuration

Currently QMK supports almost all NOR Flash chips over SPI. As such, requires a working spi_master driver configuration. You can override the driver configuration via your config.h:

config.h override Description Default Value
#define EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN SPI Slave select pin in order to inform that the FLASH is currently being addressed none
#define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR Clock divisor used to divide the peripheral clock to derive the SPI frequency 8
#define EXTERNAL_FLASH_PAGE_SIZE The Page size of the FLASH in bytes, as specified in the datasheet 256
#define EXTERNAL_FLASH_SECTOR_SIZE The sector size of the FLASH in bytes, as specified in the datasheet (4 * 1024)
#define EXTERNAL_FLASH_BLOCK_SIZE The block size of the FLASH in bytes, as specified in the datasheet (64 * 1024)
#define EXTERNAL_FLASH_SIZE The total size of the FLASH in bytes, as specified in the datasheet (512 * 1024)
#define EXTERNAL_FLASH_ADDRESS_SIZE The Flash address size in bytes, as specified in datasheet 3

!> All the above default configurations are based on MX25L4006E NOR Flash.