Re: [Xen-devel] S3 resume issues

[Ben Guthro <ben@xxxxxxxxxx>]

On Tue, Jan 15, 2013 at 1:32 PM, Malcolm Crossley
<malcolm.crossley@xxxxxxxxxx> wrote:
> On 15/01/13 18:22, Ben Guthro wrote:
>>
>> On Tue, Jan 15, 2013 at 1:17 PM, Malcolm Crossley
>> <malcolm.crossley@xxxxxxxxxx> wrote:
>>>
>>> You get 0xFF when there is nothing responding to the ioport. If the 16550
>>> is
>>> on a PCI card then it could be the PCI connection has not been setup
>>> again
>>> after the resume and you can't get to that ioport range.
>>
>> This is not a PCI card, it is on onboard card (io base 0x3f8)
>>
>> Ben
>
> Interesting, it may be the serial device requires some ACPI method to be
> called to initialise/enable it correctly.
>
> A serial port on a HP Elitebook 8570p we have seems to not initialise the
> serial port after the BIOS has started. The serial only starts working when
> the Linux kernel runs the ACPI enable method (halfway through the kernel
> boot) . I've tried to decompile the ACPI AML and it looks like it's enabling
> the serial via a microcontroller.
>
> It could be you have a similar microcontroller based serial port on your
> system which can only be initialised via ACPI.
>
> It might be worth checking that the io decode windows are enabled on the
> panther point chipset for the 0x3f8 port ranges. Check that bits 0-2 are 0
> at address 0x80 and that bit 0 is 0 at address 0x82 in PCI device 0:1f
> config space.

It looks like bit 0 is 1 at 0x82 (if I'm reading this correctly):

00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
        Subsystem: Intel Corporation Device 7270
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Capabilities: [e0] Vendor Specific Information: Len=0c <?>
00: 86 80 55 1e 07 00 10 02 04 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 70 72
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00
40: 01 04 00 00 80 00 00 00 01 05 00 00 10 00 00 00
50: f8 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 8b 80 8a 8a 90 00 00 00 85 80 8b 85 f8 f0 00 00
70: 78 f0 78 f0 78 f0 78 f0 78 f0 78 f0 78 f0 78 f0
80: 70 00 0f 3c 81 06 7c 00 41 16 0c 00 c1 07 3c 00
90: e1 02 1c 00 00 0f 00 00 00 00 00 00 00 00 00 00
a0: 14 0e a0 00 48 39 06 00 00 47 00 00 00 00 00 02
b0: 00 00 00 00 00 00 00 00 04 80 00 20 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 33 22 11 00 67 45 00 00 c0 fc 00 00 08 00 00 00
e0: 09 00 0c 10 00 00 00 00 a3 02 e4 02 00 00 00 00
f0: 01 c0 d1 fe 81 30 1a 00 87 0f 04 08 00 00 00 00


Is that something that needs to be re-enabled at resume time?

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