SM6FBQ / HackRF clone - History

PortaPack: Build DFU binary without forcing serial number to "RunningFromRAM".

This was causing problems for HackRF mode, where some host PC software was depending on a valid serial number.

PortaPack: Replace OperaCake handlers, they were tripping up host tools. Skip operacake_init if PortaPack compiled in, letting operacake_boards be all zero. Should be safe, right?

PortaPack: Silence warnings about unused functions/variables I'm liable to use soon.

I don't like the __attribute__((unused)) markup, but woud rather not delete or comment out the code.

PortaPack: Address some unused variable/function warnings.

OperaCake: Bring together with PortaPack code.

The plan is to have them coexist in the firmware binary, even if the hardware is mutually exclusive at runtime.

USB: Set Opera Cake USB handlers to null unless hardware is detected.

USB: Bring in constants from host source code.

TODO: Deduplicate this when I'm not feeling so lazy.

USB: Make vendor request handler table read/write (not const).

SPI flash: check busy flag is clear BEFORE enabling writes