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

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

--- Comment #39 from David Sebek <dasebek@gmail.com> ---
There is also another scenario when the system can hang after displaying the
EFI framebuffer information. This happens when EFI_STAGING_SIZE is too small
(e.g., 32MB) and there is no available memory surrounding the staging area. In
that case, efi_check_space correctly returns FALSE. The functions that called
it (efi_copyin, efi_readin) also return an error. The return value of
efi_readin seems to be checked by all of its callers. However, the return value
of efi_copyin is never checked.

In a KVM virtual machine with OVMF, FreeBSD boots with no apparent issues even
if EFI_STAGING_SIZE is set to 32 and efi_check_space does not expand the
allocated memory and returns errors.

On my physical machine, with EFI_STAGING_SIZE set to 32, the bootloader prints
a bunch of "efi_check_space: Unable to expand staging area" messages followed
by the EFI framebuffer information, and then it hangs. Some graphical
corruption was also displayed on the screen.

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