The mm2s and s2mm are HLS-based kernels that the Vitis compiler packages into XO files.
To build these kernels run the following commands:
v++ -c --platform <path_to_platform/platform.xpfm> -k mm2s pl_kernels/mm2s.cpp -o mm2s.xo
v++ -c --platform <path_to_platform/platform.xpfm> -k s2mm pl_kernels/s2mm.cpp -o s2mm.xo
or
make kernels