Eval¶

Biwak supports bootloader via linkerscript.

There needs to be some communication between BL and APP;

APP > BL: start app or bl?
BL -> APP: Version of BL; does this combination work Should be checked when flashing.

Lower bottom of stack can not be used because this can change with newer firmware release.

• Communication via option bytes: This way RAM has not to be preserved; incomplete updates are handled. Some cost.
• ISR-Table is relocated by Kokon
• When BL was used, Application does not need to config the clock any more. Can save a lot of flash
• Kokon should send article number and Bootloaderfirmware, so flash tool can verify if this is the correct image
• App clears option bytes again

Problem is: Bootloader and application probably have different configurations. An seperate build has to be triggered. -> Arena supports subsets now.