Here is a list of the URLs of SPD sparse matrices in the file test.txt. All these sparse matrices are from SuiteSparse Matrix Collection<https://sparse.tamu.edu/>. You can add more links or trim the existing links in the file. With the following command, these matrices listed in the test.txt file are download from the given links and then are preprocessed. It might take some time to finish the downloading and preprocessing.
$ make data_gen TARGET=hw PLATFORM=xilinx_u280_xdma_201920_3