I have been following the Software User Guide and trying to get the D2 to boot from the SD 'slot'. I have had quite a bit of trouble until I discovered that the SD slot is now found at /dev/ubb !!!
Once I figured that out I was able to get This
set bootargs 'console=ttyS0,115200
clcd.lcd1_enable=1 usb0Mode=host root=/dev/ubb2 rootwait'
to work. When I had ....root=/dev/sdb2 the boot process would hang.
Maybe I don't have the big picture, but shouldn't this kind of info be reflected in the Software User Guide?
On to uImage.d2plug_v05. I copied the file onto ubb1 and tried this
set bootcmd 'usb start; fatload usb 1:1 0x2000000 uImage.d2plug_v05; bootm 0x2000000'
but I get an error . Dont recall exact text (sorry). Should I be able to just copy the file into ubb1 and use the line as I have? Is there more to it?