• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 3 answers
  • Subscribers 33 subscribers
  • Views 420 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

XIO2001: pci-to-pci bridge disappears from PC Device Manager

FRANK1
Expert 8555 points
Part Number: XIO2001

Hi Team,

A Japanese customer request me to post this thread.

the issue as below.

↓

XIO2001 is used on Dell OPtiplex7080，

When I am using PCI bus, the expansion board disappears.

※ PCI to PCI bridge disappeared from the device manager.

Is there any way to solve this problem?

I checked scpz008b pdf

"XIO2001 PCI Express to PCI Bus Translation Bridge Silicon Errata"

I have some questions about 4 ※ in this document.

※TLP transfer may halt when ASPM L0s is enabled on the chipset and the XIO2001.

Will the device manager on the PC disappear after XIO2001 stops?

As the Workaround mentions,

Disabling ASPM L0s on either or both the chipset and XIO2001 will prevent the problem from occurring.

does it mean ASPM should be set to disable in BIOS?

If there is anything else to change, please let me know.

Thanks.

Regards,

  • 0
    TI__Guru* 93670 points

    Hi Frank,

    Yes correct BIOS has an option for ASPM L0s. This should be disabled to prevent power down of single direction of the link. Otherwise device will disappear in pc device manager.

    Regards,,Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Expert 8555 points

    Hi Nasser,

    Thank you for your reply.

    The following settings are available in Dell OPtiplex7080.

    ·Auto (default) - handshake between the device and the PCI Express hub to determine the best ASPM mode supported by the device.

    ・ Disabled-APM power management is always off.

    ・ L1 only-APM power management is set to use L1.

    Can even the setting of L1 only avoid the disappearance of XIO2001?
    Even if ASPM is set to disabled and XIO2001 disappears,
    Is it not set for ASPM L0 from the BIOS side?

    Thank you for your clarification.
    Regards,

  • 0 in reply to FRANK1
    TI__Guru* 93670 points

    Hi Frank,

    Based on what i have seen on BIOS setting, we have ASPM L0. I suppose this could be BIOS related or based on how BIOS is implemented. You can try disabled-APM or L1 only-APM.

    Regards,,Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Expert 8555 points

    Hi Nasser,

    Thank you.

    I have read the document of SCPS212J: XIO2001 PCI Express to PCI Bus Translation Bridge
    If bits 1 and 2 of 080H are set to 00,
    Can this problem be solved?

    The RW everything tool is now being used for confirmation,
    When the position circled by red in the attached image is 40h,
    I think the ASLPMC setting is identification of 00 = active state PM disabled (default).

    the address is shown below.
    www.dell.com/.../2500 1
    If 080H row and 00 column of 42 are change to 40,
    ASPM: can I think of a Disabled setting?

    As a method to confirm the setting of XIO2001 from PC,
    Is there a problem with the above?
    If it's wrong, it would be great if you could tell me other ways.

    Regards,

  • +1 in reply to FRANK1
    TI__Guru* 93670 points

    Hi Frank,

    Yes it is possible if the default value reg 0x80 is 0x42 and changing to 0x40 can disable ASPM(i.e default settings). Typically we do this through BIOS and then BIOS writes or updates reg 0x80 configuration. I think it would be good to discuss this with Dell technical support as well.

    Regards,,Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Expert 8555 points

    Hi Nasser,

    The customer is very satisfied with your answer.

    Thank you so much.

  • 0 in reply to FRANK1
    TI__Guru* 93670 points

    Hi Frank,

    We are closing this case.

    Regards,Nasser