Neither does the RK3588, which is precisely the point I was making.

From the MNT Reform Website https://shop.mntre.com/products/mnt-reform

> RK3588 > Binary DDR and GPU firmware

That makes it just as closed source as the corebooted novacustom stuff: https://novacustom.com/coreboot-laptop/

For the DDR, yes, but as for the GPU, is this still the case with Collabora's ongoing work on Panthor?

https://www.collabora.com/news-and-blog/news-and-events/tami...

While the Panthor kernel driver itself is open source, it seems to require this firmware [0] which doesn't look very open source to me.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/lin...

The GPU in the RK3588 doesn't use closed source firmware.