r336921 broke booting on MBP 2017, EFIRT related

[Yuri Pankov]

Konstantin Belousov wrote:
> On Wed, Aug 29, 2018 at 09:12:37AM -0500, Kyle Evans wrote:
>> I guess this patch might do it:
>> https://people.freebsd.org/~kevans/efi-bootmap.diff
>>
>> Linux commit messages depict a tale in which they used to also only
>> map RUNTIME entries, but they were effectively forced to back down on
>> that because of buggy firmware that does exactly what you've described
>> and they later reintroduced the restrictive mapping for i386-only
>> where they'd not found such bugs.
> 
> Orthogonal to the loader patch, please try the following.  Even better,
> try this with the stock loader.
> 
> You need to remove efirt from the kernel config for now, instead load
> efirt.ko, perhaps after the system booted into single user.  I am interested
> if the panic goes away.  You should see some interesting message from
> kernel about EFI realtime clock.
> 
> If you have any binary modules like nvidia or vbox, do not load them
> with the patched kernel.

Done, getting exactly the same fault without any new messages printed 
(made sure I'm using the updated efirt using `nm | grep efirt_fault`).