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In the next patches, we'll differentiate the PMBA IO port address that we program on PIIX4 vs. Q35. Normally we'd just turn PcdAcpiPmBaseAddress into a dynamic PCD. However, because we need this value in BaseRomAcpiTimerLib too (which cannot access RAM and dynamic PCDs), it must remain a build time constant. We will introduce its Q35 counterpart later. As first step, replace the PCD with a new macro in "OvmfPlatforms.h"; Jordan prefers the latter to fixed PCDs in this instance. Cc: Gabriel Somlo <somlo@cmu.edu> Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1333238 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Tested-by: Gabriel Somlo <somlo@cmu.edu>