More AMD EPYC Zen 4 "Genoa" Code Heads Into Coreboot

Over the past two weeks there has been a pleasant uptick in new commits to Coreboot as part of enabling EPYC 9004 "Genoa" series platform support.

Back in September was very early Genoa code for Coreboot merged along with the AMD Onyx reference motherboard target. Over the past two weeks has been another push of getting more of the Genoa code upstreamed.

Among the recent Genoa commits to Coreboot include SMI support, GPIO definitions and subsequently the GPIO support, handling for the VGA decode enable register, enabling UART, and other related work.

There's also other AMD Genoa enablement code still pending and undergoing review via review.coreboot.org.

It's nice to see this AMD EPYC Genoa support for Coreboot coming together -- just as Intel Sapphire Rapids support also has -- though so far the motherboard/platform support has been largely limited to each vendor's reference motherboards with still not much adoption by OEMs outside of custom hyperscaler deployments.

Along with the continued AMD EPYC 9004 series Coreboot work, AMD continues working on openSIL for open-source CPU silicon initialization for what in a few years is expected to replace AGESA.