RE: [Xen-ia64-devel] RFC: Switch to xlilo now? Or post-3.0?

["Yang, Fred" <fred.yang@xxxxxxxxx>]

Two things to point out -

1. elilo.efi should only give warning message if you put "vmm=..."
entries at the end of elilo.conf.  So elilo.efi can continue to work on
elilo.conf entries for the native Linux even with "vmm=" in it.  
2. elilo.efi should continue to work on "image=xen.gz  initrd=xenolinux"
boot, but you can't take advantage of loading initrd as xlilo.efi.
Unless the startup code got changed.

-Fred

Magenheimer, Dan (HP Labs Fort Collins) wrote:
> There has been various threads about attempts to boot
> Xen under RHEL4.  Because RHEL4 requires an initrd, a
> special version of elilo.efi is required.  This version
> called "xlilo" was included in the Xen/ia64 tree some
> time ago, along with a patch file (xen4elilo.patch)
> that is required to apply to Xen/ia64 for xlilo to work
> properly.
> 
> I have not applied this patch to the mainstream tree
> because, once this patch is applied to Xen/ia64:
> 
> 1) everyone will need to start booting xen with xlilo.efi
>    instead of elilo.efi.  xlilo.efi is backwards compatible
>    and the changes have been given to the elilo maintainer
>    so they will eventually get into the official elilo
>    release
> 2) everyone will need to change their elilo.conf file.
>    In existing elilo.conf files, image=xen and initrd=xenlinux.
>    In the new format, vmm=xen, image=xenlinux and initrd=initrd.
>    Elilo.conf files that contain vmm= will cause current
>    elilo.efi to fail even if just booting linux as elilo
>    parses the entire file.
> 
> Because of these changes, if we install the xen4elilo
> patch, everyone using Xen/ia64 will need to change their
> environment when they pull the changeset with the xen4elilo
> patch.  (The Cambridge Xen team calls this a "flag day".)
> 
> Should we do this now, before 3.0 goes out?  Or wait
> and do it post-3.0?  Comments please...
> 
> Thanks,
> Dan
> 
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