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Appendix C: POST Code Diagnostic LED Decoder IntelP®P Server Board S3420GP TPS
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 O X O X O X X Reserved for PCI bus
0x55h X O X O X O X O Reserved for PCI bus
0x56h X O X O X O O X Reserved for PCI bus
0x57h X O X O X O O O 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
0x5Dh X O X O O O X O
Reserved for ATA
SMBUS
0x5Eh X O X O O O O X Resetting SMBUS
0x5Fh X O X O O O O O Reserved for SMBUS
Local Console
0x70h X O O O X X X X Resetting the video controller (VGA)
0x71h X O O O X X X O Disabling the video controller (VGA)
0x72h X O O O X X O X Enabling the video controller (VGA)
Remote Console
0x78h X O O O O X X X Resetting the console controller
0x79h X O O O O X X O Disabling the console controller
0x7Ah X O O O O X O X Enabling the console controller
Keyboard (only USB)
0x90h O X X O X X X X Resetting the keyboard
0x91h O X X O X X X O Disabling the keyboard
0x92h O X X O X X O X Detecting the presence of the keyboard
Revision 1.0
Intel order number E65697-003
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