[SeaBIOS] [PATCH 1/2] Add config option to move PORT_ACPI_PM_BASE out of the way

[Gerd Hoffmann]

  Hi,

> > Doing it the other way around is tricky for initialization order
> > reasons, especially for coreboot.  pmbase and mmconf xbar (those are
> > looked up by the qemu acpi table generator) locations are (a) compile
> > time constants and (b) programmed very early at boot time.
> 
> Ahh - I vaguely recall discussing this before.
> 
> However, I don't think it makes sense for SeaBIOS to have a compile
> time definition on where to place the mappings.  Can't it be pulled
> from fwcfg?

Current smm code requires pmbase being a compile time constant.  IIRC
there was a experimental patch changing that last time we discussed
this, but it wasn't merged.

Once we have that we can make pmbase depend on fw_cfg, either indirectly
(if qemu provides acpi tables it is new enough to handle pmbase being
mapped at a non-traditional location), or by qemu suggesting a location
in a (to be created) fw_cfg file.

cheers,
  Gerd