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The EFI memory descriptor 64-bit aligns PhysicalStart on both 32- and 64-bit platforms. Make the padding explicit for i386 EFI. Submitted by: Siva Mahadevan <smahadevan@freebsdfoundation.org> MFC after: 3 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D11301