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TODO (roughly in order of importance)

• check if built firmware actually works
• update startup code with rp2040 specific functions:
  • point VTOR to vector table in flash (instead of the one stored in ROM) (done by stage2 boot loader)
  • or even better: copy vector table to RAM, for guaranteed low-latency access
  • handle second core in reset code
  • check if SDK crt0 / runtime_init contain other important or interesting stuff
    • install stack guard (MPU)
• build uf2 firmware package, probably using uf2conv
• check if integration with cortex-m-rt is correct (eg. just providing a different link.x script)
• wrap peripherals with safe abstractions from embedded-hal
• if possible, provide compatibility with probe-rs
• provide easy access to the programmable input/output blocks (PIO)
• document how the second core can be used safely
  • cortex_m::interrupt::Mutex is not sufficient on multi-core systems
  • RTIC seems to have experimental multi-core support
• maybe use the optimized functions provided in ROM?
  • also, the hardware integer divider, https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2_common/hardware_divider/include/hardware/divider.h. Would need replacing intrinsics like __aeabi_idiv
• replace stage-2 boot loader from SDK with a version written in rust
• add picotool compatible binary information