It was definitely bad idea to use 3V3_SYS as PCIE card power supply. So i connected 5V to external 3V3 LDO and used it as realtek card power supply. I was able to boot with Armbian 20.05.2 Focal / 5.4.43 and PCIE card seems to be working. Seems like my setup has some problems with PCIE soft reset, e...