[SeaBIOS] [Qemu-devel] [PATCH v2] map 64-bit PCI BARs at location provided by emulator

[Gerd Hoffmann]

  Hi,

> > > But RamSizeOver4G still doesn't allow correctly place PCI window if large
> > > amount of memory present/reserved.
> > BTW: I don't think it's good practice to change semantics of an old interface
> > in general. It's less confusing to leave old interface as is (obsoleting it
> > eventually) and use a new one.

> I agree.  The RamSizeOver4G (as passed via three cmos bytes) is ugly -
> lets not make it more complex.

Also it would mix up two different (although related) things:  Actual
memory and reserving address space for memory (which then might be
hotplugged).

> Any new info can be passed via fw_cfg.

Plan is to extend the existing e820 table passed from qemu.  Today it
carries reservations only.  We can stick ram ranges in there too.

cheers,
  Gerd