kern/52229: 11" mid-2012 MacBook Air crashes very early in boot from UEFI

To: kern-bug-people%netbsd.org@localhost,gnats-admin%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost
Subject: kern/52229: 11" mid-2012 MacBook Air crashes very early in boot from UEFI
From: venture37%geeklan.co.uk@localhost
Date: Fri, 12 May 2017 00:50:00 +0000 (UTC)

>Number:         52229
>Category:       kern
>Synopsis:       11" mid-2012 MacBook Air crashes very early in boot from UEFI
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 12 00:50:00 +0000 2017
>Originator:     Sevan Janiyan
>Release:        NetBSD-HEAD
>Organization:
>Environment:
>Description:
Attempting to boot the latest NetBSD-7.99.71-amd64-uefi-install.img on a MacBookAir5,1 results in a crash.
System in question has 8GB of RAM but kernel only reports 512MB

Photos of crash along with output from memmap & efivar commands can be found at 
http://www.netbsd.org/~sevan/mbp2012/
>How-To-Repeat:
Boot NetBSD-7.99.71-amd64-uefi-install.img on a 11" mid-2012 MacBook Air
>Fix:

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