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Olaf Rempel f4952aaa63 Implement a virtual bootloader section ...

- patch reset vector while programming flash page0
  Let the reset vector always point to the twiboot start.
- Use another (must be unused!) ISR vector to store the original
  reset vector as jump to the application.
- Cache the values for the verification read
- currently works only for devices < 8kB flash (2 byte vector entries)
- using a attiny85 as target

This change is heavily based on the optiboot bootloader.

2020-10-26 18:54:00 +01:00

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