[Bug 236838] Commit r340224 prevents loading the kernel for some Intel Xeon hardware

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236838

--- Comment #6 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to longwitz from comment #5)
I think it is not the 0xce register read which causes the hang, but the need to
map very large (255MB) region by chomping from virtual_avail which causes the
breakage.  You can recheck this by keeping your debugging printfs but reverting
the removal of the case line.

You dmesg shows the
""PCIe: Memory Mapped configuration base @..."
line so the memory-mapped config access method works, and this is what I looked
for when asking for dmesg.

Please try the attached patch, if my understanding is right, it should be
the proper fix.

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