From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TBcro-0006Ym-Gu for kexec@lists.infradead.org; Wed, 12 Sep 2012 02:39:53 +0000 Message-ID: <504FF4DB.6030601@redhat.com> Date: Wed, 12 Sep 2012 10:35:07 +0800 From: Dave Young MIME-Version: 1.0 Subject: Re: [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel References: <20120905054445.GA6370@dhcp-16-143.nay.redhat.com> <5047DBA9.8030000@hp.com> <504815EB.9000701@redhat.com> <5048E40E.7040003@hp.com> <5049B6AD.9000304@redhat.com> In-Reply-To: <5049B6AD.9000304@redhat.com> 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: Khalid Aziz Cc: horms@verge.net.au, kexec@lists.infradead.org, vgoyal@redhat.com On 09/07/2012 04:56 PM, Dave Young wrote: > > I did some digging about the efi boot kdump in slackware with kernel > from latest linus tree. I'm surprise that kdump works even without these > "noefi" and "acpi_rsdp=" > > With fedora 17 3.4.3 kernel passing "acpi_rsdp=" is enough for kdump > kernel booting. > > Actually in x86 setup code if bootloader do not pass correct efi_info in > boot_params efi_enabled will be set to 0 automaticlly. > > So as for this patch 'noefi' is not needed. > > I will do more testing to see why linus tree works without "acpi_rsdp=" > There's probably some efi changes between 3.4.3 - 3.6.0-rc4 cause this works. I have not got time to bisect it. Because it works without explicitly passing the kernel param, I will not update the patch anymore. Thanks everyone for your comments. -- Thanks Dave _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec