Real life kept me busy, but I finally had a moment and added SPI interface to the FGPA design. It allows the use of SD card, but needs driver software, so I also have spent a little time building some software. At this point the software is a simple memory dumper, controlled by button presses. Very useful for hardware testing, and now that there is simple user interface capability it will be hopefully easy to get the SD card driver side done and tested.