Re: [Xen-devel] [PATCH 00/17 v5] SBSA UART emulation support in Xen

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 23 Jun 2017, Julien Grall wrote:
> Hi Bhupinder,
> 
> On 22/06/17 08:38, Bhupinder Thakur wrote:
> > There are some TBD items which need to be looked at in the future:
> > 
> > 1. Currently UEFI firmware logs the output to hvc console only. How can
> >    UEFI firmware be made aware of pl011 console and how it can use it
> >    as a console instead of hvc.
> 
> Would it be possible to summarize the discussions we had a couple of weeks ago
> here?
> 
> > 2. Linux seems to have hvc console as the default console i.e. if no
> >    console is specified then it uses hvc as the console. How can an
> >    option be provided in Linux to select either hvc or pl011 as the
> >    default console.
> 
> I am wondering what would happen if you use stdout-path in the device-tree.
> Does it override the default console?
> 
> IHMO, the best way to select the default console would be using either the
> SPCR (for ACPI) or stdout-path (for DT). But the HVC console does not have any
> description in the firmware. It might be worth considering adding description.
> 
> The drawback is the user would always have to specify the console on the
> command line. I think this is not too bad for a first approach.
> 
> > 
> > 3. ACPI support for pl011 device.
> 
> I would be ok to defer this after PL011 series is merged.
> 
> > Bhupinder Thakur (17):
> >   xen/arm: vpl011: Move vgic register access functions to vreg.h
> >   xen/arm: vpl011: Rename vgic_reg* functions definitions and calls to
> >     vreg_reg*
> 
> Stefano, would it be possible to commit those patches? They are both acked and
> it would avoid Bhupinder to carry them and rebase them if the vGIC code has
> changed.

Sure

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