The ROM bootloader in XWR1642 pre-production devices is not compatible with SFLASH variants that support extended addressing mode. In particular, the “Number of Address length” field of the SFDP command response being non-zero is not supported. The total SFLASH addressable region in XWR1642 devices is 8 MBytes. Thus, “Number of Address length” = 0 (corresponding to 3 bytes address length) satisfies the addressable range. However, the compatibility issue is with variants that allow for 3 or 4 bytes address length.

This incompatibility will be addressed in the production version of the XWR1642 silicon.