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Re: [Qemu-devel] [PATCH 0/2] ACPI/arm-virt: add DBG2
From: |
Andrew Jones |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] ACPI/arm-virt: add DBG2 |
Date: |
Wed, 9 Sep 2015 07:52:13 +0200 |
User-agent: |
Mutt/1.5.23.1 (2014-03-12) |
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