16-24 Vol. 3B

INTERPRETING MACHINE-CHECK ERROR CODES

Table 16-28.  Interconnect MC Error Codes for IA32_MCi_STATUS, i = 5, 12, 19

Type

Bit No.  Bit Function 

Bit Description

MCA error 

codes

1

 

0-15

MCACOD

Bus error format: 1PPTRRRRIILL
The two supported compound error codes:
- 0x0C0F - Unsupported/Undefined Packet
- 0x0E0F - For all other corrected and uncorrected errors

Model specific 

errors

21-16

MSCOD

The encoding of Uncorrectable (UC) errors are:
00h - UC Phy Initialization Failure.
01h - UC Phy detected drift buffer alarm.
02h - UC Phy detected latency buffer rollover.
10h - UC link layer Rx detected CRC error: unsuccessful LLR entered abort state
11h - UC LL Rx unsupported or undefined packet.
12h - UC LL or Phy control error.
13h - UC LL Rx parameter exchange exception.
1fh - UC LL detected control error from the link-mesh interface
The encoding of correctable (COR) errors are:
20h - COR Phy initialization abort
21h - COR Phy reset
22h - COR Phy lane failure, recovery in x8 width.
23h - COR Phy L0c error corrected without Phy reset
24h - COR Phy L0c error triggering Phy reset
25h - COR Phy L0p exit error corrected with Phy reset
30h - COR LL Rx detected CRC error - successful LLR without Phy re-init.
31h - COR LL Rx detected CRC error - successful LLR with Phy re-init.
All other values are reserved.

31-22

MSCOD_SPARE

The definition below applies to MSCOD 12h (UC LL or Phy Control Errors)
[Bit 22] : Phy Control Error
[Bit 23] : Unexpected Retry.Ack flit
[Bit 24] : Unexpected Retry.Req flit
[Bit 25] : RF parity error
[Bit 26] : Routeback Table error
[Bit 27] : unexpected Tx Protocol flit (EOP, Header or Data)
[Bit 28] : Rx Header-or-Credit BGF credit overflow/underflow
[Bit 29] : Link Layer Reset still in progress when Phy enters L0 (Phy training should 

not be enabled until after LL reset is complete as indicated by 

KTILCL.LinkLayerReset going back to 0).
[Bit 30] : Link Layer reset initiated while protocol traffic not idle
[Bit 31] : Link Layer Tx Parity Error

37-32

Reserved

Reserved

52-38

Corrected Error Cnt

56-53

Reserved

Reserved

Status register 

validity 

indicators

1

 

57-63