Product guide

QSSC-S4R Server System Product Guide Appendix A: POST Codes
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Appendix A: POST Codes
The system BIOS displays error messages on the video screen. Before video initialization, beep codes inform
you of errors. POST error codes are logged in the event log. The BIOS displays POST error codes on the video
monitor.
Eight light-emitting diodes indicate the raw binary output of port 80 values. These LEDs are arranged so you can
see a direct correlation to the binary equivalent. The table shows the correlation of port 80 post code bit to LED
reference designator.
Table 51. Port 80 POST Code LEDs
Port 80 POST Code Bit LED Reference Designator
7 (MSB) DS4E8
6 DS4E7
5 DS4E6
4 DS4E5
3 DS4E4
2 DS4E3
1 DS4E2
0 (LSB) DS4E1
POST Progress Codes and Messages
During the system boot process, the BIOS executes several platform configuration processes, each of which is
assigned a specific hex POST code number. As each configuration routine is started, the BIOS displays the
POST code on the POST code diagnostic LEDs found on the back edge of the server board. To assist in
troubleshooting a system hang during the POST process, the diagnostic LEDs can be used to identify the last
POST process to be executed.
Table 52. POST Progress Codes and Messages
Pro
gr
ess Code Pro
gr
essCodeDefinition
Host Processor
0x10 Power-on initialization of the host processor (Boot Strap Processor)
0x11 Host processor cache initialization (including AP)
0x12 Starting application processor initialization
0x13 SMM initialization
Chipset
0x21 Initializing a chipset component
Memory
0x22 Reading configuration data from memory (SPD on DIMM)
0x23 Detecting presence of memory
0x24 Programming timing parameters in the memory controller
0x25 Configuring memory parameters in the memory controller
0x26 Optimizing memory controller settings
0x27 Initializing memory, such as ECC init
0x28 Testing memory
PCIe Bus
0x50 Enumerating PCIe buses
0x51
A
llocating resources to PCIe buses