pico_get_unique_board_id: Unique id is not always unique

[ThinkTransit]

I have 2 Pico W boards that return the same unique id with pico_get_unique_board_id()

For Pico W devices this can be resolved by combining with the mac address to form a unique combination, not sure what options exist for non wireless version.

[liamfraser]

@ThinkTransit do you have any more detail here? Was this a flash binary or a no flash build? No flash binaries are not expected to have a unique ID. On RP2040 the unique ID comes from the flash chip. I assume they are not sharing the same flash chip?

[ThinkTransit]

@liamfraser I flashed the boards with the Pimoroni micropython firmware. Boards aren't using the same flash chip.

Looking through the micropython code it calls pico_get_unique_board_id().

I checked all my boards and it is only 2 boards that have the same unique_id so maybe it is a freak occurrence?

[liamfraser]

I think this might just be a freak occurrence. Potentially we could mix in the WiFi mac address on Pico W @peterharperuk, although that would require initializing the wireless driver at start of day which is probably undesirable.

[ThinkTransit]

@liamfraser thanks yes it must be, I haven't seen it happen with any other boards. Maybe I just won the UUID lottery.

Will reopen it I come across it again.

[Tonykids]

I bought 50 luatos-rp2040 boards 6 monthon ago for my project and find they return the same unique id.
finally I find that it uses PY25Q32 instead of normal W25Q32 .
PY25Q32 has 128bit unique ID,this may be the problem.

[lurch]

@Tonykids See #1641

[peterharperuk]

@Tonykids Any idea where I can get one of those boards for testing a fix for this?

[lurch]

@Tonykids You might like to test #1819 ?