Re: [PATCH v10 3/4] ARM64: ACPI: enable ACPI_SPCR_TABLE

[Hanjun Guo]

On 2016/9/9 0:34, Mark Salter wrote:
> On Thu, 2016-09-08 at 12:16 +0100, Will Deacon wrote:
> > On Wed, Sep 07, 2016 at 12:30:19PM +0300, Aleksey Makarov wrote:
> > > On 09/05/2016 03:36 PM, Aleksey Makarov wrote:
> > > > SBBR mentions SPCR as a mandatory ACPI table.  So enable it for ARM64
> > > >
> > > > Earlycon should be set up as early as possible.  ACPI boot tables are
> > > > mapped in arch/arm64/kernel/acpi.c:acpi_boot_table_init() that
> > > > is called from setup_arch() and that's where we parse SPCR.
> > > > So it has to be opted-in per-arch.
> > > >
> > > > When ACPI_SPCR_TABLE is defined initialization of DT earlycon is
> > > > deferred until the DT/ACPI decision is done.  Initialize DT earlycon
> > > > if ACPI is disabled.
> > > Hi Will, Catalin,
> > >
> > > Can you review this patch and consider ACKing it please?
> > Hanjun, Al, Mark, Graeme -- any comments on this?
> >
> > Will
>
> I think there is a problem still with systems using 32-bit access to 8250
> UARTs (i.e. Mustang) but that will need a DBG2 table spec change and
> followup patch to resolve.

Hmm, I think you mean we can add patches later with the spec updated,
and this patch works with SBSA pl011 can go for now?

Thanks
Hanjun