#38 Consider Adding EEPROM or SD Card

[Harrison Fletcher]

Kenneth MacCallum 2021-02-04 07:44:31 PST
If the SFDQ had an eeprom, then this could be used both for non-volatile storage, but also for a secure way to update firmware.

• transfer the new firmware to eeprom in chunks until complete
• then CRC it to ensure it's correct
• then invoke bootloader
• I believe bootloader can load new code directly from certain eeproms

Kenneth MacCallum 2021-02-04 08:13:18 PST
Actually, the built in bootloader cannot load from eeproms. Still, it feels more secure to first load the new code onto a local eeprom and then load into flash, instead of doing it over the uart.

[Harrison Fletcher]

Leaving this ticket open for investigation into booting from SPI flash. Potentially made possible by the addition of an SD card on SPI3 in rev X7.

[Harrison Fletcher]

https://www.st.com/resource/en/application_note/an4286-spi-protocol-used-in-the-stm32-bootloader-stmicroelectronics.pdf