From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dirk Behme Date: Fri, 29 Jan 2016 16:54:45 +0100 Subject: [U-Boot] ARMv8: Use U-Boot to boot Xen? In-Reply-To: <1454059136.26591.95.camel@hellion.org.uk> References: <56AA66B6.6010308@gmail.com> <20160129040415.GB7475@linux-7smt.suse> <1454059136.26591.95.camel@hellion.org.uk> Message-ID: <56AB8B45.5070801@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 29.01.2016 10:18, Ian Campbell wrote: > On Fri, 2016-01-29 at 12:04 +0800, Peng Fan wrote: >> Hi Dirk, >> >> Cc Ian xen experts. >> >> On Thu, Jan 28, 2016 at 08:06:30PM +0100, Dirk Behme wrote: >>> Hi, >>> >>> are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64 >>> system? >>> >>> I've found >>> >>> http://lists.denx.de/pipermail/u-boot/2015-October/230077.html >>> >>> what might be helpful. >>> >>> But maybe I missed anything else? >> >> I guess you are asking steps how to boot xen using uboot? >> >> You may need to take this: >> http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions > > Indeed. > > In addition one AArch64 system which uses u-boot and which has concrete > instructions is the APM X-Gene/Mustang: > http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/APMXGeneMustang > which would likely be helpful. Yes, that page is very helpful, thanks! But I think it misses one information, or most probably the configuration on that board is different. Above page just do a 'run xen_run' which in the end does the necessary tftp loading and finally the bootm to start Xen. So I'd assume that on that board U-Boot runs at EL3 or EL2 (?). In my environment, U-Boot runs at EL1. I.e. after loading Xen by tftp I somehow need to switch to EL2 to be able to start Xen. And this is what I think I miss. How to switch from U-Boot running at EL1 to hypervisor mode EL2? Therefore I'd think that http://lists.denx.de/pipermail/u-boot/2015-October/230077.html might be helpful. Best regards Dirk