[Bug 264267] UEFI Booting on Azure Generation 2 VMs crashes

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 27 May 2022 00:15:42 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264267

--- Comment #1 from Michael Baptist <mbaptist.opensource@gmail.com> ---
A little more background the Azure EFI firmware has a free memory region at
0x200000, however for larger kernels the EFI copy will write into EFI memory
and cause a fault.

The before we trampoline the new EFI_COPY_DISABLE option will allow us to skip
copying and sets up page tables for 4G of physical memory (I think) and should
map in our kernel in place. This all seems to work fine. Once the Kenrnel is
loaded and we run sysinit I can see the trademark, copyright, an <BOOT>
(boottag) stuff printing and then the console dies. I assume those sysinit
functions are not the problem but others might be causing it to crash in some
way. (Maybe vm subsystem code?)

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