how free software is the rk3576 cpu?

On youtube explaining computers says radxa will sell the radxa 4d computer for the next 10 years. He says its performance is about the performance of a raspberry pi 5. On
https://www.collabora.com/news-and-blog/news-and-events/rockchip-rk3588-upstream-support-progress-future-plans.html
callabora says rk3576 is a cpu they are working on. Meaning collabora tries to turn the rk3576 into a cpu able to run on free software? Is it known which pieces of non free software for now is required to make the cpu run? Thanks.