Instead of using 16 byte BLAKE2s with a dummy key, use plain vanilla
unkeyed 32 byte BLAKE2s for partition checksum.
Co-authored-by: Mikael Ågren <mikael@tillitis.se>
- Rename functions, defines, et c to indicate that it's a checksum
over the partition, not necessarily a cryptographic hash digest even
though we use a version of BLAKE2s.
- Add comments describing where the checksum is stored and what it is
used for.
Co-authored-by: Mikael Ågren <mikael@tillitis.se>
- Add per app flash storage
- Adds four data areas. An app can allocate an area. Once allocated
the area is tied to the CDI of the app and can only be
read/written/deallocated by the same app.
- Add two pre loaded app slots to flash
- Load an app from the first slot at boot. The app digest must match a
specific digest specified in firmware.
- Optionally load an app from the second slot
- Add a resetinfo area in FW_RAM which is used to signal an app's intent
of resetting the system and, optionally, pass data to firmware or the
next app in a bootchain.
Co-authored-by: Jonas Thörnblad <jonas@tillitis.se>
Co-authored-by: Mikael Ågren <mikael@tillitis.se>
Co-authored-by: Daniel Jobson <jobson@tillitis.se>
