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[efi] Work around broken UEFI keyboard drivers
Some UEFI keyboard drivers are blissfully unaware of the existence of either Ctrl key, and will report "Ctrl-<key>" as just "<key>". This breaks substantial portions of the iPXE user interface. Work around these broken UEFI drivers by allowing "ESC <key>" to be used as a substitute for "Ctrl-<key>". Tested-by: Dreamcat4 <firstname.lastname@example.org> Signed-off-by: Michael Brown <email@example.com>
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