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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1243 Sata device path format:Sata(HPN, PMPN, LUN) According to UEFI Spec, the PMPN is an integer between 0 and 65535 and is optional. If not provided, the default is 0xFFFF. This commit is to do the enhancement for Sata device path when optional para is not specified. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>