Lots of things I could but will not volunteer to. I have every reason to believe any party requesting amd/bettong to be maintained, and having access to such board, has designed and potentially manufactured some custom board based on that particular reference design. Yet I have not seen this party contributing anything to the maintenance of the tree in the past 4 or so years. What goes around comes around, I don't mind amd/bettong disappearing at all.
In my case I have a bettong and pademelon demoboards and i would like to get them supported by coreboot. We don't manufacture any product with these processors but maybe they are viable options in a near future.
I've been able to make it work the vboot, a TPM/TPM2 through LPC and the SATA but there are minor changes that I don't mind to contribute. I think that I only can be useful to report the board status with every release but I think I'm not able to develop any feature on them.
Regards Jorge