I guess I can use the v18.0 version of the tools. In the 19.1 version of the tools, when I follow your instructions and I get to step 5, after running $: make, I get
jfrye@jfrye-Inspiron-5547:~/Documents/FPGA/Intel/de1-soc_ref/Demonstrations/SOC_FPGA/hps_dma/software/spl_bsp$ make
Please visit Building Bootloader for Stratix 10 and Agilex | Documentation | RocketBoards.org for instructions on how to build the bootloader.