Several people have asked about this, so figured it deserves its own topic.
For years now, I’ve provided highly optimized/customized builds of coreboot/Tianocore (UEFI) for
Chromebooks/Chromeboxes. Once I started working for Purism, I added support for Librem laptops too (and as of today, the Mini as well). These firmware images are built from my personal tree, which adds a lot of fixes/tweaks/optimizations for running Windows (and in some cases, MacOS) which aren’t suitable for merge into upstream coreboot. They do not in any way negatively impact running Linux, and in some cases there are benefits as well.
These builds are free, unofficial, and unsupported. You can revert to the official Purism firmware at any time.
You will need to install a UEFI capable OS, or at the very least install a UEFI bootloader (systemdboot, grub-efi-amd64, rEFInd, etc) but that’s not something I plan on providing support for.
and yes, expect the Librem 14 to be supported once it is released.