Hi, > Another possibility is to leave the write_ops in there, but turn them > into no-ops.
That is the safe choice. Just have a write function with /* nothing, write support removed in qemu 2.4+ */. That is basically the same we have today (writes are ignored), but a bit more efficient because we kill the unused infrastructure to register writable fw_cfg entries and thus don't have to do the lookup just to figure there is no match ;) cheers, Gerd
