PSA: Old-stock AMD AM4 boards might not boot with Ryzen APUs
by from Techreport on (#3FTW7)
Update 2/14/2018, 9:45 AM: AMD has posted a support page with steps users can take to resolve this specific issue should they build an unbootable system with a Ryzen APU and an older motherboard. The company suggests updating motherboard firmware using a compatible CPU, requesting assistance from a retailer with a compatible CPU, requesting an RMA exchange for a compatible motherboard, or using an AMD-provided boot kit to update the firmware. The original article continues below.
As builders shop AMD's Ryzen desktop processors with Radeon Vega graphics onboard , they can rest somewhat assured that a Ryzen 3 2200G or Ryzen 5 2400G will physically fit into and light up the various ports and slots of Socket AM4 motherboards ...