[Bug 209821] UEFI - installation media hangs when booting on ASUS P6P67 DELUXE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209821

--- Comment #25 from Conrad Meyer <cem at freebsd.org> ---
Re: EFI_STAGING_SIZE, IIRC loader assumes it can get 512 MB of contiguous
memory, and/or doesn't consult the memory map to check for conflicts, or
something like that.  With a slightly older 11.x version of efiloader, we had
some hardware that couldn't boot with 128 MB memory (OOM) and some hardware
that couldn't boot with 512 MB memory (crash).  The sweet spot we found was
something like 380 MB for our hardware (which has custom BIOS/firmware anyway),
but that's a very limited subset of the real hardware in existence.

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