It seems to be a 32 bit MIPS based CPU.
The last Gentoo MIPS stages are from 2014.
The GPU is unlikely to be open, which means you will either run it as a framebuffer, so the GPU won't be used at all or you will need evil binary modules for the kernel, which will tie you to a kernel contemporary with the device, if they exist and can be found.
It would be an interesting intellectual exercise to do it but of not practical value whatsoever.
I suspect that you will be leading the way, so you will be very much on your own.
If you know where to start, go ahead and try. If not, practice the skills you will need on something known to work.
That way you can separate out problems with lack of skills and problems with Gentoo not working.
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.