Using just the D command, FLEX for the 6809 now boots entirely from the SD card. All of the SD tools from the 6800 version have been built for 6809 FLEX and work fine, and all files needed to build/install 6809 FLEX are built within 6809 FLEX. Ie, drivers can be modified all within the target OS.
The system used for development and testing consists of an SS-50 motherboard, the 6809 CPU board, a serial board, a parallel board, and the SD Card System. Nothing fancy at all.
All I need to do now is put together official boot images (DSK files) and put a complete 6809 system bundle onto the shopping pages.
So, just to make this official: 6809 FLEX now runs entirely on the Corsham Technologies based SS-50/SS-30 cards!