82576EB Datasheet, PDF (33/34 Pages) Intel Corporation – LAN Access Division

Intel^® 82576EB GbE Controller - Errata
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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Revision: 2.85
September 2012
Intel^® 82576EB GbE Controller
Specification Update
33