I have a connex-400xm, a serial console board, and a netDUO board
connected together. The trio works fine. The connex is running build
But, when I put a SD card into the card slot of the netDUO board and
boot, the card is never seen. When I get into the GUM> prompt and type
'mmcinit' it says 'No MMC card found'.
What am I doing wrong?