From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH] Remove warning in efi_enter_virtual_mode Date: Thu, 18 Apr 2013 13:13:35 -0700 Message-ID: <517053EF.2030900@zytor.com> References: <1366127886-31460-1-git-send-email-bryan.odonoghue.lkml@nexus-software.ie> <516EAC4A.6040202@console-pimps.org> <516F1B90.9040508@nexus-software.ie> <516FD24A.3070502@console-pimps.org> <20130418163325.GA6884@leaf> <5170216C.9020300@zytor.com> <20130418164457.GB6884@leaf> <51704FA8.7060801@console-pimps.org> <1366315083.13667.19.camel@x230.lan> <51705366.8070001@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51705366.8070001-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Darren Hart Cc: Matthew Garrett , Matt Fleming , Josh Triplett , Bryan O'Donoghue , "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Ingo Molnar , Thomas Gleixner , Josh Boyer List-Id: linux-efi@vger.kernel.org On 04/18/2013 01:11 PM, Darren Hart wrote: >> >> I would expect that if there are any 32-bit UEFI systems that ship with >> BGRT support (and Darren makes it sound like that's a possibility), >> there's a realistic chance of the BGRT ending up allocated above the >> highmem barrier. > > I can certainly ensure we sit below that barrier on the MinnowBoard. We > can also speak with the Intel UEFI firmware development teams to see > about making that a requirement. I don't know if we'll be successful, > but Matt, Peter, and I have recently coaxed some changes of that nature in. > No, that is the wrong approach. The HIGHMEM barrier is a Linux kernel construct and isn't even guaranteed to be the same from one boot *of the same kernel* to another. The value 896M is merely the default, but it can be affected by both compile time and command line options. -hpa