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Date: Tue, 11 Nov 2014 12:44:58 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Ed Maste <emaste@freebsd.org>
Subject: Re: svn commit: r273582 - in head/sys/amd64: amd64 include
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Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
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On Mon, Nov 10, 2014 at 03:18:04PM -0500, Ed Maste wrote:
> On 24 October 2014 05:48, Roger Pau Monn?? <royger@freebsd.org> wrote:
> > Author: royger
> > Date: Fri Oct 24 09:48:58 2014
> > New Revision: 273582
> > URL: https://svnweb.freebsd.org/changeset/base/273582
> >
> > Log:
> >   amd64: make uiomove_fromphys functional for pages not mapped by the DMAP
> 
> UEFI boot fails after this commit. I haven't yet investigated in
> depth, but it appears to hang after the loader transfers execution to
> the kernel. It's likely a panic before the vt console is ready, I
> think.
> 

This is weird.  The patch does not touch anything which could be used
before e.g. filesystem i/o is started.

I cannot outright exclude a possibility that it is used too early, but
indeed we need a panic message and backtrace, if any.  Do you have
serial console ?

BTW, are you sure that this is EFI-related ?  Wouldn't it panic with
legacy boot ?