Hi Colin, thanks for your reply.
We're trying to set up a boundary scan chain to test several BGA devices on one of our PCBs. I'm new to JTAG but I believe the BSDL file is required as it contains the boundary scan information for the IC under test. The datasheet states that the CYW43438 supports boundary scan over SDIO, I'm not sure how to use this without a BSDL file.
Do you have any ideas?