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:

quoted

On 09/05/2016 03:36 PM, Aleksey Makarov wrote:

quoted

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.