tnx for your effort. it doesnt work however.
the device is never attached/loaded as usb device on my host pc, so never 2207:320a is listed.
the serial console always immediately simply states:
U-Boot SPL 2016.11-rc1-g3aebcab (Dec 23 2016 - 11:19:12)
Trying to boot from MMC1
Card did not respond to voltage select!
spl: mmc init failed with error: -95
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###
i guess i really have to find a hardwired way to go to the maskrom and reflash a correct uboot loader.
somebody know how to do this exactly (i mean what pins exactly needs to be shortcut and what sequence exactly is needed (shortcut, power up, recovery or so, ???)