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[lkrnprefix] Copy command line before installing iPXE
The command line may be situated in an area of base memory that will be overwritten by iPXE's real-mode segments, causing the command line to be corrupted before it can be used. Fix by creating a copy of the command line on the prefix stack (below 0x7c00) before installing the real-mode segments. Reported-by: Dave Hansen <dave@sr71.net> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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