Hi, I am working on a TPM CRB device (last sent version: https://lists.gnu.org/archive/html/qemu-devel/2017-10/msg02014.html). It's a sysbus device, and when starting qemu with i440, I get "Option '-device tpm-crb' cannot be handled by this machine".
The check comes from machine_init_notify(), checking that the machine has_dynamic_sysbus. Apparently, q35 supports it. But not i440. If I declare has_dynamic_sysbus in piix, the device works fine. Marcel, could we do something similar to piix to what you did for q35?: commit bf8d492405feaee2c1685b3b9d5e03228ed3e47f Author: Marcel Apfelbaum <mar...@redhat.com> Date: Mon Jun 27 18:38:33 2016 +0300 q35: allow dynamic sysbus thanks -- Marc-André Lureau