Re: [Xen-devel] [Fwd: Installing from distribution CDs]

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

This patch was not meant for inclusion but I still should have put this 
for good measure:
Signed-off-by: Anthony Liguori

Anthony Liguori wrote:

> On Wed, 2005-02-02 at 12:39, Jared Rhine wrote:
>  
>
> > I don't think so; the bottom of my /linuxrc execs /sbin/init.  This
> > marks the end of the standard initrd process of doing a pivot-root and
> > getting on with life.  It doesn't have to be an either/or between
> > linuxrc and init.
> >    
> This is likely to support older kernels as initrd does a pivot for you.
>
>  
>
> > As mentioned, I can't speak to the innards, but I can offer solid
> > proof that I need an init=/linuxrc on my boot line, and that this
> > snippet would not be needed if I wasn't using a Xen'ed kernel.  On a
> > regular kernel, the /linuxrc is found and used automatically in
> > preference to /sbin/init, if it is present.
> >    
> Now here's something for you to do which should be confusing as the
> solution.  Add a root=/dev/hdc or whatever to your command line and I
> bet it will work without the init=/linuxrc.
>
> Apparently what's happening is that at some point during the domain boot
> process, Xen decides that the root device is /dev/ram0 if there is no
> root= command line on the kernel.  In
> init/do_mounts_rd.c:rd_load_image() if the ramdisk loads to what it
> thinks is the root device, the initrd actions are never taken.
>
> Of course, patching that function to remove that check results in the
> same behavior.  I've not yet tracked down what's going on but that's the
> problem.
>
> I've also included a new patch against a recent xen-unstable.  It's
> another proof-of-concept one.  This time, I can actually start a rescue
> CD properly (which means initrd is working with SLES-9).  The distro
> install doesn't work though.  However, another 2.6-based distro might
> have more luck.
>
> Regards,
>
>  
--
Anthony Liguori
anthony@xxxxxxxxxxxxx



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