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Some motherboards exposes MCFG1/MCFG2 instead of one ACPI MCFG table, thus no /sys/firmware/acpi/tables/MCFG exists but MCFG1 and MCFG2. Read MCFG1 if MCFG doesn't exist. The same issue report/fix is at https://github.com/intel/pcm/issues/74. Tracked-On: #8514 Signed-off-by: Xin Zhang <xin.x.zhang@intel.com>