MKR Zero and Nano 33 IoT released as UF2

[fgallaire]

They need to be released as BIN

[fgallaire]

Shouldn't apply to Circuit Playground Express and Trinket M0 (and all M0 boards) too as I don't understand how 488 KB and 359 KB UF2 can be flashed on 256 KB MCU ?

[dhalbert]

The UF2 files are not densely packed. Each 512-byte block consists of at most 476 bytes of data, and possibly less: https://github.com/microsoft/uf2.

There are UF2 bootloaders available for mkrzero and nano33iot in https://github.com/adafruit/uf2-samdx1/tree/master/boards, but you are right, we should publish .bin as well.

[fgallaire]

OK thanks @dhalbert for the explanation

[fgallaire]

There are UF2 bootloaders available for mkrzero and nano33iot in https://github.com/adafruit/uf2-samdx1/tree/master/boards, but you are right, we should publish .bin as well.

Yes, but I see no Arduino boards in the releases

The UF2 files are not densely packed. Each 512-byte block consists of at most 476 bytes of data, and possibly less: https://github.com/microsoft/uf2.

So, if the .bin file used to generate the UF2 file is under 256 KB, the UF2 file is always good to be flashed regardless its real size ?

[tannewt]

They are now released as bin and uf2.