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Date: Thu, 13 Nov 2014 20:22:51 +0100
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Subject: Re: [Qemu-devel] [Linaro-acpi] [RFC PATCH 0/7] hw/arm/virt: Dynamic
 ACPI v5.1 table generation
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To: Al Stone <al.stone@linaro.org>, Gerd Hoffmann <kraxel@redhat.com>, Peter Maydell <peter.maydell@linaro.org>
Cc: "Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>, "linaro-acpi@lists.linaro.org" <linaro-acpi@lists.linaro.org>, Claudio Fontana <claudio.fontana@huawei.com>, QEMU Developers <qemu-devel@nongnu.org>, "stefano.stabellini@citrix.com" <stefano.stabellini@citrix.com>, "tech@virtualopensystems.com" <tech@virtualopensystems.com>, Parth Dixit <parth.dixit@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>



On 13/11/2014 19:16, Al Stone wrote:
>> > [root@fedora ~]# cat /proc/ioports 
>> > [ ... ]
>> >   0600-063f : 0000:00:01.3
>> >     0600-0603 : ACPI PM1a_EVT_BLK
>> >     0604-0605 : ACPI PM1a_CNT_BLK
>> >     0608-060b : ACPI PM_TMR
>> >   0700-070f : 0000:00:01.3
>> >     0700-0707 : piix4_smbus
>> > [ ... ]
> So this is problematic: the PM1a_EVT_BLK and PM1a_CNT_BLK should not
> exist if hardware reduced mode ACPI is being used; the values in the
> FADT should be zero so there should be no ioports (see section 5.2.9
> of the ACPI spec).  If this is from an ARM platform, it _should_ be in
> hardware reduced mode.  QEMU will have to take that into account.

No, this is x86.  As mentioned elsewhere in the thread, we'd have to add
a GPIO controller (e.g. PL061) to mach-virt, to replace GPE.

Paolo