rework bootloader's SPI flash access #321
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* remove "presence detection" by reading manufacturer ID * added new presence detection mechanism by checking if the WEL bit of the flash status register can be set and cleared again * added new configuration option to select spi flash address width (2,3 or 4 bytes)
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Triggered by #319 (by @jpf91) this PR reworks some of the bootloader's SPI flash functionality and configuration options:
WEL(write enable latch) of the flash status register can be set and cleared again.0x04: write disable - which is a standard commandSPI_FLASH_ADDR_BYTES: number of address bytes (2,3,4) -> 2=16-bit, 3=24-bit, 4=32-bit, default = 3 / 24-bitThe SPI address size (as well as all other bootloader customization options) can be modified at compile time. Example (configuring 16-bit address width):
sw/bootloader$ make USER_FLAGS+=-D'SPI_FLASH_ADDR_BYTES=2' clean_all exe📚 The bootloader's documentation is also updated accordingly by this PR.