Currently Supported hardware features for ATSAMD21J18A

Projects General Guidance
1

I'm trying to scope the FW work on a new project and could use a list of Arduino supported features on this processor. Is there a place that lists processors and known good driver support and known bugs/limitations? If not does anyone have experience with these processor peripherals to know that they are functional in the released code?

I'm looking for:
1 - I2C Master - SerCom1
1 - I2C Slave - SerCom 0
1 - SPI Master - SerCom 3
1 - Aux SerCom - SerCom5
1 - UART - SerCom 2
1 - USB
20 - GPIOs

Hardware is yet to be committed so changing port assignment based on errata and existing driver support is possible.

2

Is there a place that lists processors and known good driver support and known bugs/limitations?

I very much doubt it, to the extent that I would guess no. That is not the sort of thing that generally exists as it takes a lot of time to compile and keep up to date and it would not be in the interest of anyone to keep such a database.