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128 Intel® Server System SR2500AL User’s Guide
Figure 96. Diagnostic LED Placement Diagram
LSB MSB
Back edge of server board
USB Port
USB Port
Diagnostic LEDs
Table 12. Diagnostic LED POST Code Decoder
Checkpoint Diagnostic LED Decoder Description
G=Green, R=Red, A=Amber
MSB LSB
Host Processor
0x10h OFF OFF OFF R Power-on initialization of the host processor
(bootstrap processor)
0x11h OFF OFF OFF A Host processor cache initialization (including AP)
0x12h OFF OFF G R Starting application processor initialization
0x13h OFF OFF G A SMM initialization
Chipset
0x21h OFF OFF R G Initializing a chipset component
Memory
0x22h OFF OFF A OFF Reading configuration data from memory (SPD
on DIMM)
0x23h OFF OFF A G Detecting presence of memory
0x24h OFF G R OFF Programming timing parameters in the memory
controller
0x25h OFF G R G Configuring memory parameters in the memory
controller
0x26h OFF G A OFF Optimizing memory controller settings
0x27h OFF G A G Initializing memory, such as ECC init
0x28h G OFF R OFF Testing memory