[PATCH v2 3/3] xen/arm: allow console=hvc0 to be omitted for guests

[Stefano Stabellini]

On Wed, 18 Feb 2015, Ian Campbell wrote:
> On Wed, 2015-02-18 at 09:50 -0600, Rob Herring wrote:
> > On Wed, Feb 18, 2015 at 7:51 AM, Julien Grall <julien.grall at linaro.org> wrote:
> > > From: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> > >
> > > This patch registers hvc0 as the preferred console if no console
> > > has been specified explicitly on the kernel command line.
> > >
> > > The purpose is to allow platform agnostic kernels and boot images
> > > (such as distro installers) to boot in a Xen/ARM domU without the
> > > need to modify the command line by hand.
> > 
> > How does this interact with DT chosen stdout-path?
> 
> I think it shouldn't any more than the existing calls from e.g. the 8250
> driver to preferred_console do.
>
> > Is there a node for hvc0?
> 
> Not a direct one, it is inferred from the presence of the general Xen
> node.

Xen PV consoles, including hvc0, as all the other Xen PV devices are
advertised on xenstore.


> I did vaguely consider handling a stdout-path pointing to that --
> but it seemed a bit of an abuse.