Intel S5000PAL manual Host Processor, Chipset, Memory

USB Port	USB Port	Diagnostic LEDs
Back edge of server board
		MSB	LSB

Figure 17. Diagnostic LED Placement Diagram

Table 11. 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

54 Intel® Server Board S5000PAL User’s Guide