https://wccftech.com/amd-ryzen-5000-zen-3-desktop-cpus-running-on-a320-x370-motherboards-b450-support-added/

According to AMD's board partners, select A320 & X370 motherboards will feature full support for AMD Ryzen 5000 Desktop CPUs while Gigabyte and ASUS have already released BIOS support for the Zen 3 based processors in BETA version (via @Harukaze5719)

The report comes from various forums where users have already got access to BETA BIOS for the A320 & X370 motherboards which allows support for AMD Ryzen 5000 Desktop CPUs. According to a member of Chiphell Forums, the AMD 300-series motherboards can fully support the Ryzen 5000 series processors and one such sample has been shown running on an entry-level ASRock A320M-HDV motherboard.