5 Troubleshooting
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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
PCI Bus
0x50h OFF R OFF R Enumerating PCI busses
0x51h OFF R OFF A Allocating resources to PCI busses
0x52h OFF R G R Hot Plug PCI controller
initialization
0x53h OFF R G A Reserved for PCI bus
0x54h OFF A OFF R Reserved for PCI bus
0x55h OFF A OFF A Reserved for PCI bus
0x56h OFF A G R Reserved for PCI bus
0x57h OFF A G A Reserved for PCI bus
USB
0x58h G R OFF R Resetting USB bus
0x59h G R OFF A Reserved for USB devices
Checkpoint
code
Diagnostic LED Decoder
Description
G=Green, R=Red, A=Amber
MSB LSB
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