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Appendix B: POST Code LED Decoder 
Intel® Server System SR1695GPRX TPS 
  
Revision 
1.5 
Intel order number: G11332-006 
62
Table 62. 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 
1 
1 
1 
0 0 
Ah Ch 
Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated 
as ACh. 
Table 63. Dianostic LED POST Code Decoder 
Checkpoint 
Diagnostic LED Decoder 
Description 
O = On, X=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 
0x04h 
X X X X X O X X Early processor initialization (flat32.asm) where system BSP is selected  
0x10h 
X X X O X X X X Power-on initialization of the host processor (Boot Strap Processor) 
0x11h 
X X X O X X X O Host processor cache initialization (including AP) 
0x12h 
X X X O X X O X Starting application processor initialization 
0x13h 
X X X O X X O O SMM initialization 
Chipset 
0x21h  X X O X X X X O 
Initializing a chipset component 
Memory 
0x22h 
X X O X X X O X Reading configuration data from memory (SPD on FBDIMM) 
0x23h 
X X O X X X O O Detecting presence of memory 
0x24h 
X  X O X 
 X O X X 
Programming timing parameters in the memory controller 
0x25h 
X X O X X O X O 
Configuring memory parameters in the memory controller 
0x26h 
X X O X X O O X 
Optimizing memory controller settings 
0x27h 
X X O X X O O O 
Initializing memory, such as ECC init 
0x28h 
X X O X O X X X 
Testing memory 
PCI Bus 
0x50h 
X O X O X X X X Enumerating PCI buses 
0x51h 
X O X O X X X O Allocating resources to PCI buses 
0x52h 
X O X O X X O X Hot Plug PCI controller initialization 
0x53h 
X O X O X X O O Reserved for PCI bus 
0x54h X 
Reserved for PCI bus 
0x55h X 
Reserved for PCI bus 
0x56h X 
Reserved for PCI bus 
0x57h X 
Reserved for PCI bus  
USB 
0x58h  X O X O O X X X 
Resetting USB bus 
0x59h 
X O X O O X X O 
Reserved for USB devices 
ATA/ATAPI/SATA 
0x5Ah 
X  O X  O O X  O X Resetting SATA bus and all devices 
0x5Bh 
X  O X  O O X  O O Detecting the presence of ATA device 
0x5Ch 
X  O X  O O O X  X Enable SMART if supported by ATA device