Post Code Checkpoints; Figure 27. Location Of Diagnostic Leds On The Intel; Server Board X38Ml; Table 48. Post Progress Code Led Example - Intel X38ML - Server Board Motherboard Technical Manual

Error Reporting and Handling
Since the red bits correspond to the upper nibble and the green bits correspond to the lower
nibble, the two are concatenated to be ACh.
LEDs Red
Ach 1
Result Amber
MSB

Figure 27. Location of Diagnostic LEDs on the Intel

6.3.2

POST Code Checkpoints

Diagnostic LED Decoder
Checkpoint
G=Green, R=Red, A=Amber
MSB
Host Processor
0x10h OFF OFF
0x11h OFF OFF
0x12h OFF OFF
0x13h OFF OFF
Chipset
0x21h OFF OFF
Memory
0x22h OFF OFF
0x23h OFF OFF
0x24h OFF G
0x25h OFF G
0x26h OFF G
0x27h OFF G
0x28h G OFF
PCI Bus
0x50h OFF R
0x51h OFF R
0x52h OFF R
0x53h OFF R
98

Table 48. POST Progress Code LED Example

8h 4h
Green Red
1 0
Green
PCI Express* x16
Right edge of board

Table 49. POST Code Checkpoints

LSB
OFF R Power-on initialization of the host processor (bootstrap processor)
OFF A Host processor cache initialization (including AP)
G R Starting application processor initialization
G A SMM initialization
R G Initializing a chipset component
A OFF Reading configuration data from memory (SPD on FBDIMM)
A G Detecting presence of memory
R OFF Programming timing parameters in the memory controller
R G Configuring memory parameters in the memory controller
A OFF Optimizing memory controller settings
A G Initializing memory, such as ECC init
R OFF Testing memory
OFF R Enumerating PCI busses
OFF A Allocating resources to PCI busses
G R Hot-Plug PCI controller initialization
G A Reserved for PCI bus
Intel order number E15331-006
2h
Green Red
1 1 0
Red
Diagnostic LEDs
MSB LSB
®

Server Board X38ML

Description
Intel® Server Board X38ML
1h
Green Red Green
0 0
Off
LSB
Revision 1.3