Re: [Xen-devel] Will Xen support PCI add-on card for serial ports?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

It worked for me, on one particular test machine, by relying on BIOS auto-config of the PCI device, then a one-line patch to dom0 kernel to prevent it from executing ACPI _DIS on the PCI/ISA link. I don’t know how generally applicable my approach is.

 -- Keir


On 16/7/08 04:12, "Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx> wrote:

Thanks. I got it. We have hard coded the iobase and irq in the driver of Xen, but it doesn’t work. L

Thanks
Xiaohui
 

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From: Neo Jia [mailto:neojia@xxxxxxxxx]
Sent: Wednesday, July 16, 2008 10:29 AM
To: Xin, Xiaohui
Cc: Keir Fraser; <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Will Xen support PCI add-on card for serial ports?


That is the only change that I have made. But the dom0 still hang0.



Let me know if you are able to pass that.



Thanks,

Neo

---------

I would remember that if researchers were not ambitious

probably today we haven't the technology we are using!


On Jul 15, 2008, at 7:20 PM, "Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx> wrote:

Hi, Neo,
We are also interested in the PCI serial card enabling in Xen.
Will you share some experience here? Do you still do some other effort like enable the PCI devices or you just add the command line as you mails said before?
 
Thanks
Xiaohui
 

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From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Neo Jia
Sent: Wednesday, July 16, 2008 5:58 AM
To: Keir Fraser
Cc:  <mailto:xen-devel@xxxxxxxxxxxxxxxxxxx> xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Will Xen support PCI add-on card for serial ports?

Keir,

Just commented out that function call, but it still hangs.

Thanks,
Neo

On Tue, Jul 15, 2008 at 2:44 PM, Keir Fraser < <mailto:keir.fraser@xxxxxxxxxxxxx> keir.fraser@xxxxxxxxxxxxx> wrote:

I had to patch dom0 kernel not to disable the serial interrupt line as it booted. I don't have the patch conveniently to hand unfortunately, but I think it was to remove the line 'acpi_ut_evaluate_object(..., "_DIS", ...)' in drivers/acpi/pci_link.c:acpi_pci_link_add().

 -- Keir



On 15/7/08 22:20, "Neo Jia" < <mailto:neojia@xxxxxxxxx> neojia@xxxxxxxxx> wrote:

Keir,

I tried your method with my serial port PCI card and I got the Xen output from it. But the Dom0 hangs later. Is there anyway to debug it?

 14 serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
 15 terminal --timeout=50 serial console

 21 title Xen 3.3 VT-d (unstable)
 22     root (hd0,0)
 23     kernel /xen-3.3.gz iommu=0 com1=115200,8n1,0x1070,11 console=com1,vga
 24     module /vmlinuz-2.6.18.8-xen ro
 25     module /initrd-2.6.18.8-xen.img

04:00.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) (prog-if 02 [16550])
        Subsystem: LSI Logic / Symbios Logic 2S (16C550 UART)
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at 1070 [size=8]
        Region 1: I/O ports at 1068 [size=8]
        Region 2: I/O ports at 1060 [size=8]
        Region 3: I/O ports at 1058 [size=8]
        Region 4: I/O ports at 1050 [size=8]
        Region 5: I/O ports at 1040 [size=16]

Thanks,
Neo

On Mon, Jul 14, 2008 at 12:10 AM, Keir Fraser < <mailto:keir.fraser@xxxxxxxxxxxxx> keir.fraser@xxxxxxxxxxxxx> wrote:
On 13/7/08 01:57, "Neo Jia" < <mailto:neojia@xxxxxxxxx> neojia@xxxxxxxxx> wrote:

> Thanks a lot! Could you give an Xen command line example?

com1=115200,8n1,0xc00,5 console=com1

...would set up console output at 115200 baud, 8 data bits, no parity, 1
stop bit. The I/O-port base for the UART has been determined to be 0xc00,
and the UART interrupts on IRQ line 5.

> BTW, do you know which PCI card can be supported by Xen?

No, I only have experience (and even that only a little) with unbranded
generic PCI serial cards.

 -- Keir

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