Thanks Fomi, but that tutorial is for a 833 mounted in a PCIe /SPI to USB adaptor then connected to a raspi usb port. Nothing really related to the EVB board where we can mount the RAK833 with an already specific gateway HW design including the RAK634 for Wifi b/g/n and rest of components like LAN /WAN Eth ports, serials debugs etc.
Ive bough this EVB because of this design, not really interested in a raspi solution. the RAK 831 is for that more convenient and supported.

So do you have any timeframe where we can have OpenWRT with the lora module working as a TTN GW on this RAk833 /RAK634 EVB board?