The same issue is here: https://lists.01.org/pipermail/edk2-devel/2018-February/021403.html

Is the ram disk API supported in the UEFI Interactive Shell v2.2 EDK II UEFI v2.40?
I can successfully load RamDiskDxe.efi, however, where to go from there?

Joe Teumer > 
Systems Verification Engineer

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