flash/nor/spi: add boyamicro byq16b

[krisjdev]

Adds support for BYQ16B, otherwise OpenOCD throws an error: Error: Unknown flash device (ID 0x00154068)

Chip markings: BYT BYQ16B MI2406

[lurch]

I suspect you probably want to add this to the upstream OpenOCD repo, rather than Raspberry Pi's downstream fork?
Or do you have some custom board based around RP2040 or RP2350 that happens to use this flash chip?

[krisjdev]

Not a custom board or anything like that, but I actually found it on a Pico clone. I ran into some issues with debugprobe not working so I thought the Raspberry Pi repo would be a good fit for this change, happy to try to move it to the OpenOCD repo if you think it would be better.

[lurch]

but I actually found it on a Pico clone.

Interesting! Do you have a web-link to that product?

I thought the Raspberry Pi repo would be a good fit for this change

Yes, if there are Pico boards using this Flash chip, then the PR to this repo was the correct thing to do 👍 (see also e.g. #84 )

[krisjdev]

Do you have a web-link to that product?

Yeah! I got the USB C variants from here:

• https://www.aliexpress.com/item/1005003371056277.html
• https://www.aliexpress.com/item/1005003939874702.html

Although they don't actually mention the flash chip model anywhere in the description, I guess uf2 flashing just works out of the box and the majority of people end up using that anyways.

then the PR to this repo was the correct thing to do

Awesome :) Hope this change helps someone else at least