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Currently, we always assign 0x3F8 as port base io address for emualted COM1 of SOS. But in some board, it use serial port which has other base io address for debugging purpose. And this serial port info is also exposed to SOS by ACPI table. In this case, SOS could access the debugging serial port because it could see the port from ACPI table and conflict with ACRN. To mitigate this issue, we could let emulated COM1 of SOS to use native debugging serial port base io port and irq info. Tracked-On: #4998 Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>