Re: [Qemu-devel] [PATCH 0/2] ACPI/arm-virt: add DBG2

[Andrew Jones <drjones@redhat.com>]

On Wed, Sep 09, 2015 at 12:25:45PM +0800, Shannon Zhao wrote:
> 
> 
> On 2015/9/8 21:04, Leif Lindholm wrote:
> > On Tue, Sep 08, 2015 at 11:18:27AM +0800, Shannon Zhao wrote:
> >> On 2015/9/7 22:23, Leif Lindholm wrote:
> >>> The Debug Port Table 2 (DBG2) is mandated by the ARM Server Base Boot
> >>> Requirements specification. Add the DBG2 table definitions, and set up
> >>> an entry in the ARM virt machine for the pl011 UART.
> >>
> >> Looking at Documentation/arm64/acpi_object_usage.txt in Linux kernel, it
> >> says
> >> "
> >> DBG2   Signature Reserved (signature == "DBG2")
> >>        == DeBuG port table 2 ==
> >>        Microsoft only table, will not be supported.
> >> "
> >> It seems that Linux kernel doesn't support or need it, but Windows
> >> requires it. So does it need to test this on Windows?
> > 
> > No, it can be tested under Linux with the set I just sent out:
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-September/368614.html
> 
> So you need to change Documentation/arm64/acpi_object_usage.txt as well.
> But that is kernel side.

I also wonder if Documentation/arm64/arm-acpi.txt should have its
"Booting using ACPI tables" section updated to reference (describe even?)
the use of SPCR. Maybe Leif's already doing that with the
this-time-really-for-upstream kernel spcr patches.

drew