https://wccftech.com/amd-radv-radeon-vulkan-drivers-enable-raytracing-support-on-older-gpus-including-rdna-1-vega-polaris/

The Open-source graphics library, MESA, has added Raytracing support on older AMD Radeon GPUs with the latest RADV drivers.

According to the latest merge request, after AMD RDNA 2, it looks like older AMD GPUs which include RDNA 1, Vega, and Polaris series will also be getting support for Vulkan Ray-tracing with RADV 'Radeon Vulkan' drivers.