Re: grub-lnstall option (UEFI) for chainloading

[Andrei Borzenkov]

12.10.2015 19:39, Daniel Kiper пишет:
> On Mon, Oct 12, 2015 at 12:31:54PM +0300, Andrei Borzenkov wrote:
> > On Tue, Sep 8, 2015 at 12:39 AM, Barry Jackson <address@hidden> wrote:
> > > On 06/06/15 09:38, Andrei Borzenkov wrote:
> > > > ?? Fri, 05 Jun 2015 14:56:20 +0100
> > > > Barry Jackson <address@hidden> ??????????:
> > >
> > >
> > > > > Any progress on this?
> > > >
> > > >
> > > > Not really, sorry. Do you have any suggestion how such option should be
> > > > named?
> > >
> > > Sorry for delay - this got lost in the noise.
> > >
> > > Well something like --no-id-or-nvram ??
> > >
> > > Not really bothered about the name! :)
> >
> > I was about to suggest a patch when I realized that this probably is
> > currently useless on EFI. I.e. to actually chainload grub on EFI it
> > must reside on a partition accessible by firmware which practically
> > means it should be ESP.
> >
> > Unless someone submits patch to make grub2 EFI core.img multiboot2
> > compliant with tag to skip ExitBootServices.
>
> Relevant patches waiting for review for months. I am working on v3.
> If they are upstreamed I will be happy too.

Your patches implement "client side" support (loading MB2 images); but 
EFI grub is not MB2 and has no provision for being loaded this way. Also 
it is PE, not ELF.

Actually chainloading probably could be made to work on arbitrary 
filesystem if argument parsing is added (to pass along cmdpath).