Table 17. | POST Code - Port 80h Codes |
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| Diagnostic LED Decoder |
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| Note: | G=Green, R=Red, |
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Code |
| A=Amber |
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| Description |
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| MSB |
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F4h |
| R | A |
| R |
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| Load | micro code to all CPUs. |
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F6h |
| R |
| A | A |
| R |
| Scan | SMBIOS GPNV areas. |
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15h |
| Off | G |
| Off |
| A |
| 8254 | timer test on channel 2. |
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15h |
| Off | G |
| Off |
| A |
| Enable 8042. |
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15h |
| Off | G |
| Off |
| A |
| Keyboard reset. |
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26h |
| Off | G |
| A |
| Off |
| Initialize LCD, if supported. |
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| Set Video Mode: initialization before setting the video mode is | |
28h |
| G | Off | R |
| Off |
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| complete. Configuring the monochrome mode and color mode | ||
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| settings next. |
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29h |
| G | Off | R |
| G |
| Debugger hook. |
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2Ah | G |
| Off | A |
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| Init PCI devices and motherboard devices. Pass control to video | ||
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| BIOS Start serial console redirection. |
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2Bh | G |
| Off | A |
| G |
| Platform hook. |
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2Dh | G |
| G | R |
| G |
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| Initialize AMI display manager module. | Initialize support code for | |
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| headless system if no video controller is detected. | |||||||
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2Dh | G |
| G | R |
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| Scan flash for logos and Initialize logo data areas. | |||
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30h |
| Off | Off | R |
| R |
| Detect PS/2 mouse. |
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30h |
| Off | Off | R |
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| Hook after c000 ROM control. |
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2Eh | R |
| R | A |
| Off |
| Set up video parameters in BIOS data area. |
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37h |
| Off | G | A |
| A |
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| Activate ADM: the display mode is set. | Displaying the | |
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| message next. |
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37h |
| Off | G | A |
| A |
| Initialize language module. Display splash logo. | |||
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37h |
| Off | G | A |
| A |
| Display | |||
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38h |
| G | Off | R |
| R |
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| Detect USB mouse: initializing the bus input, and general devices | ||
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| next, if present. |
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34h |
| Off | G | R |
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| Reset IDE controllers. |
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39h |
| G | Off | R |
| A |
| Displaying bus initialization error messages. |
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3Ah | G |
| Off | A |
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| Display Setup Message the new cursor position has been read and | ||
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| saved. Displaying the hit setup message next. | |||||||
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40h |
| Off | R | Off |
| Off |
| Ensure timer keyboard interrupts are on. |
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| Memory Test: the amount of memory above 8 MB has been found | |
4Bh | G |
| R | G |
| G |
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| and verified. Checking for a soft reset and clearing the memory | ||
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| below 8 MB for the soft reset next. If this is a | |||||||
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| going to checkpoint 4Eh next. |
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57h |
| Off |
| A | G |
| A |
| Chipset hook after memory size. |
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53h |
| Off | R | A |
| A |
| Display processor cache size. |
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54h |
| Off | A | Off | R |
| Disable parity and NMI reporting. |
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continued
100 | xSeries 343 Hardware Maintenance Manual |
