Re: [Xen-devel] About booting Xen with UEFI on FastModel

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-12-11 at 19:06 +0800, Chen Baozi wrote:
> On Dec 11, 2013, at 18:59, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> 
> > On Wed, 2013-12-11 at 13:06 +0800, Chen Baozi wrote:
> >> Hi Ian,
> >> 
> >> On Dec 9, 2013, at 23:35, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> >> 
> >>> On Mon, 2013-12-09 at 23:15 +0800, Chen Baozi wrote:
> >>>> Hi all,
> >>>> 
> >>>> I noticed that upstream UEFI is now supported ARMv8 on FastModel.
> >>>> Iâve tried it to boot Linux with it. And it works. But it seems
> >>>> it still cannot load Xen hypervisor properly. Iâm now looking for
> >>>> the reasons. Is there any difference for a firmware to load Xen
> >>>> and Linux kernel?
> >>> 
> >>> I think you are the first one to try Xen on EFI.
> >>> 
> >>> Are you using the EFI stub with Linux or are you launching via a
> >>> bootloader e.g. Grub-EFI?
> >> 
> >> After reading the source code, I think it is neither the EFI stub
> >> or a bootloader. A Linux Loader EFI application has been developed
> >> for ARM in EFI.
> > 
> > Do you have a link? I'm curious.
> 
> Instructions to EFI on AArch64:
> 
> http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=ArmPlatformPkg/AArch64
> 
> And Iâm using the git clone of its svn repository:
> 
> https://github.com/tianocore/edk2.git
> 
> Under the tree, the Linux Loader locates at:
> 
> ArmPkg/Application/LinuxLoader

Ah that, yes I think that boots Linux using the zImage protocol.

> > 
> >> It is able to boot Linux either by tagged list or
> >> dtb method. However, it hardcoded the start address of 0x80000 
> >> when loading Linux kernel, which make it unworkable for Xen after
> >> paging is enable.

0x80000 is a problem due to the alignment not being 2M I think?

Really should look into fixing that. (would probably mean allowing Xen
to span 2 consecutive 2MB blocks and some additional fiddling during
bring up)

>  But Iâm not sure whether there would be other
> >> problems for it to boot Xen. And Iâll continue to work on it until
> >> it can boot Xen successfully at the end.
> > 
> > Have fun ;-)
> > 
> >> (At least, there are early printk messages on the UART now, :-))
> > 
> >> 
> >> Cheers,
> >> 
> >> Baozi
> 



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