Revision: 2.85

September 2012

Specification Update

33

Implication: A BMC that uses the Get NC-SI Pass-through Statistics command and expects the

response format as described in the NC-SI Specification will not parse the response as

intended by the 82576, and will obtain inaccurate statistics.

Workaround: The BMC can account for the different format provided by the 82576 and parse the

response accordingly.

Status:

A1, A2 NoFix

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43. PCIe: Receiver Overflow Error

Problem:

When a MemWr transaction with 64-bit address, 64-bit data, and ECRC is received, the

posted data (PD) CREDITS_RECEIVED flow control counter is not incremented.

Implication: No immediate effect. However, after 4064 of these packets, the CREDITS_ALLOCATED

counter value wraps around and passes the CREDITS_RECEIVED counter value, resulting

in a Receive Overflow error. This is an uncorrectable error that generally causes a

system hang or crash.

This issue can only occur on a system that generates ECRC. Typically, Intel platforms do

not support ECRC generation and are not susceptible to this issue.

Workaround: Do one of the following:

•

Do not perform QWORD (64-bit) writes to the device.

•

Disable ECRC generation on the root port to which the device is connected.

•

Use 32-bit addressing for any BAR through which a QWORD MemWr transaction may be

performed. This can be guaranteed by setting EEPROM word 0x21, bits 11:10 to 00b and (for

SR-IOV systems) EEPROM word 0x25, bit 2 to 0.

Status:

A1, A2 NoFix

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44. PF's MSI TLP Might Contain the Wrong Requester ID When a VF Uses MSI-X

Problem:

When using IOV, if a PF uses MSI interrupts and one or more VFs use MSI-X interrupts,

some of the MSI TLPs for the PF might contain the wrong Requester ID.

Implication: There could be missing interrupts on the PF since the incorrect Requester ID could result

in the virtualization mechanism misrouting or dropping TLPs.

Workaround: If any VFs use MSI-X, all PFs should also use MSI-X.

Status:

A1, A2 NoFix

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