From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: [PATCH OSSTEST v2 07/19] Enable chain loading to local disk for UEFI PXE systems. Date: Fri, 19 Jun 2015 10:57:07 +0100 Message-ID: <1434707827.28264.71.camel@citrix.com> References: <1434644687.28264.53.camel@citrix.com> <1434644710-28881-7-git-send-email-ian.campbell@citrix.com> <21891.1394.883513.829686@mariner.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <21891.1394.883513.829686@mariner.uk.xensource.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian Jackson Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Thu, 2015-06-18 at 18:52 +0100, Ian Jackson wrote: > Ian Campbell writes ("[PATCH OSSTEST v2 07/19] Enable chain loading to local disk for UEFI PXE systems."): > > First arrange for bootloader to be installed to removable media path, > > by using a new in Jessie preseed option. Then use that to chainload a > > bootloader from the disk. > > The `removable media path' is a UEFI path that refers to part of the > fixed disk drive ? Yes, it is the UEFI standardized path (per arch) to an EFI executable which the firmware can/should boot by default when told to boot from a removable device (CD, USB stick, etc). (AIUI, etc). Somewhat like the UEFI equivalent of a stage 1 bootloader in the MBR on a floppy or something. It's a fairly common BIOS bug to default to using this path (rather than the data base of boot options) for non-removable disks too, which is why Jessie gained an option to install a bootloader there too. Which was serendipitous for us here... Ian.