Does anyone know what TPM's are compatible?
Sorry, can't help with that.
I also want to know what coreboot's tpm support is
like these days, such
as how can you perform an erase/reset like one could with a standard OEM
Is that in the realm of the BIOS? SeaBIOS does have some TPM support
upstream, and there have been one or two patchsets hanging around for
quite a while. They make a fairly complete impression - they may all
be upstream already..?