Local parameter in FPGA

To avoid specifying it at synthesis, may be patched into a Block RAM's initial state in bitstream
Bitstream may be stored in a flash memory chip
Loaded into FPGA from flash on power-on
Only a subset of Pico's boards have flash
Others have to be configured from host before use
Not host-unreadable in existing boards as-is
May be retrievable via partial reconfiguration
A hardware revision may be made
e.g., a jumper to enable configuration mode
Pico would do it if there's demand