From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from qmta01.emeryville.ca.mail.comcast.net ([2001:558:fe2d:43:76:96:30:16]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TQebk-0006Iw-4j for kexec@lists.infradead.org; Tue, 23 Oct 2012 13:33:24 +0000 Message-ID: <1350999198.30243.43.camel@rhapsody> Subject: Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting From: Khalid Aziz Date: Tue, 23 Oct 2012 07:33:18 -0600 In-Reply-To: <20121022154300.GD3401@redhat.com> References: <20121018031608.GA3925@localhost.localdomain> <878vb332a9.fsf@xmission.com> <20121019145300.GC27052@redhat.com> <874nlole1c.fsf@xmission.com> <20121022154300.GD3401@redhat.com> Mime-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Vivek Goyal Cc: Dave Young , horms@verge.net.au, kexec@lists.infradead.org, "Eric W. Biederman" On Mon, 2012-10-22 at 11:43 -0400, Vivek Goyal wrote: > On Sat, Oct 20, 2012 at 08:06:23PM -0700, Eric W. Biederman wrote: > > [..] > > It is the non-pure UEFI case where non-UEFI table scans work. > > > > Of course it puzzles me why we can't find the table via scanning memory > > when running in a pure UEFI environment. Ah well that is a problem for > > another day. > > I have the same question. Why can we find acpi tables by scaning in > non-uefi case and why same is not possible in case of UEFI. I had sent an explanation out on Friday but looks like my email got stuck somewhere, and I don't see it on kexec list archive. On a UEFI machine with CSM, kernel finds RSDP by searching through EBDA. On a UEFI machine with no CSM, there is no EBDA I believe and kernel fails to find RSDP. Here is the message I see on a UEFI machine with no CSM: ACPI BIOS Bug: Error: A valid RSDP was not found (20120913/tbxfroot-219) -- Khalid _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec