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LoongArch64: Pcie devices that come with OPROM may require large Mem Space, and downgrading all 64 Bit Bars may result in insufficient space. REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4157 Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Ray Ni <ray.ni@intel.com> Cc: Chao Li <lichao@loongson.cn> Signed-off-by: Dongyan Qian <qiandongyan@loongson.cn> Co-authored-by: Bo Zhu <zhubo@loongson.cn> Reviewed-by: Chao Li <lichao@loongson.cn> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>