There's now support for ppc64el as well. And that's the complete list: amd64 arm64 ppc64el, as there's no kernel support for persistent memory on any other architecture, nor there's any rumour anyone is working on that -- either in software or hardware. Thus, no new arch will be added to the list in foreseable future.
As you seem to care a lot about Ubuntu, the new dependency (libpmem-dev) has just been approved for MIR (LP#1790856). And, the person who's doing adapting work had problems because of no pmem support in qemu... Meow! -- ⢀⣴⠾⠻⢶⣦⠀ The ill-thought conversion to time64_t will make us suffer from ⣾⠁⢠⠒⠀⣿⡁ the Y292B problem. So let's move the Epoch by 435451400064000000 ⢿⡄⠘⠷⠚⠋⠀ (plus a safety margin in case of bad physicists) and make it ⠈⠳⣄⠀⠀⠀⠀ unsigned -- that'll almost double the range.
