Technical Product Specification

Intel® Server System SR1695WB TPS Appendix B: POST Code LED Decoder
Revision 1.4
Intel order number: E92079-005
56
Table 56. POST Progress Code LED Example
LEDs
Upper Nibble LEDs Lower Nibble LEDs
MSB LSB
LED #7 LED #6 LED #5 LED #4 LED #3 LED #2 LED #1 LED #0
8h 4h 2h 1h 8h 4h 2h 1h
Status
ON OFF ON OFF ON ON OFF OFF
Results
1 0 1 0 1 1 0 0
Ah Ch
Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
Table 57. POST Progress Code LED Example
Checkpoint
Diagnostic LED Decoder
Description
1 = On, 0=Off
Upper Nibble Lower Nibble
MSB LSB
8h 4h 2h 1h 8h 4h 2h 1h
LED #7 #6 #5 #4 #3 #2 #1 #0
Host Processor
0x10h 0 0 0 1 0 0 0 0 Power-on initialization of the host processor (bootstrap processor)
0x11h 0 0 0 1 0 0 0 1 Host processor cache initialization (including AP)
0x12h 0 0 0 1 0 0 1 0 Starting application processor initialization
0x13h 0 0 0 1 0 0 1 1 SMM initialization
0x14h 0 0 0 1 0 1 0 0
Selection of Processor with least features to be used as Boot Strap
Processor
0x15h 0 0 0 1 0 1 0 1 Switch an AP processor to become the new Boot Strap Processor
Chipset
0x21h 0 0 1 0 0 0 0 1 Initializing a chipset component
Memory
0x22h 0 0 1 0 0 0 1 0 Reading configuration data from memory (SPD on FBDIMM)
0x23h 0 0 1 0 0 0 1 1 Detecting presence of memory
0x24h 0 0 1 0 0 1 0 0 Programming timing parameters in the memory controller
0x25h 0 0 1 0 0 1 0 1 Configuring memory parameters in the memory controller
0x26h 0 0 1 0 0 1 1 0 Optimizing memory controller settings
0x27h 0 0 1 0 0 1 1 1 Initializing memory, such as ECC init
0x28h 0 0 1 0 1 0 0 0 Testing memory
0xE4h 1 1 1 0 0 1 0 0
BIOS cannot communicate with DIMM (serial channel hardware
failure)
0xE6h 1 1 1 0 0 1 1 0
DIMM(s) failed Memory iBIST or Memory Link Training failure
0xE8h 1 1 1 0 1 0 0 0
No memory available (system halted)
0xE9h 1 1 1 0 1 0 0 1
Unsupported or invalid DIMM configuration (system halted)
0xEAh 1 1 1 0 1 0 1 0
DIMM training sequence failed (system halted)
0xEBh 1 1 1 0 1 0 1 1
Memory test failed (system halted)
0xECh 1 1 1 0 1 1 0 0
Unsupported or invalid DIMM configuration (system halted)
0xEDh 1 1 1 0 1 1 0 1
Unsupported or invalid DIMM configuration (system halted)
0xEBh 1 1 1 0 1 0 1 1
DIMM with corrupted SPD data detected (system halted)
QuickPath Interconnect (QPI)
0xA0h 1 0 1 0 0 0 0 0
QPI Initialization
0xA1h 1 0 1 0 0 0 0 1
QPI Initialization
0xA2h 1 0 1 0 0 0 1 0
QPI Initialization
0xA3h 1 0 1 0 0 0 1 1 QPI Initialization
0xA4h 1 0 1 0 0 1 0 0
QPI Initialization
0xA5h 1 0 1 0 0 1 0 1
QPI Initialization
0xA6h 1 0 1 0 0 1 1 0 QPI Initialization
0xA7h 1 0 1 0 0 1 1 1 QPI Initialization
0xA8h 1 0 1 0 1 0 0 0
QPI Initialization
0xA9h 1 0 1 0 1 0 0 1
QPI Initialization