Checkpoint | Description |
39 | Initializes |
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3A | Initialize RTC date/time. |
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3B | Test for total memory installed in the system. Also, Check for DEL or ESC |
| keys to limit memory test. Display total memory in the system. |
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3C | Mid POST initialization of chipset registers. |
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40 | Detect different devices (Parallel ports, serial ports, and coprocessor in CPU, … |
| |
| etc.) successfully installed in the system and update the BDA, EBDA…etc. |
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52 | Updates CMOS memory size from memory found in memory test. Allocates |
| memory for Extended BIOS Data Area from base memory. Programming the |
| memory hole or any kind of implementation that needs an adjustment in system |
| RAM size if needed. |
60 | Initializes |
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75 | Initialize |
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78 | Initializes IPL devices controlled by BIOS and option ROMs. |
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7C | Generate and write contents of ESCD in NVRam. |
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84 | Log errors encountered during POST. |
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85 | Display errors to the user and gets the user response for error. |
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87 | Execute BIOS setup if needed / requested. Check boot password if |
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| installed. |
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8C | Late POST initialization of chipset registers. |
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8D | Build ACPI tables (if ACPI is supported) |
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8E | Program the peripheral parameters. Enable/Disable NMI as selected |
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90 | Initialize system management interrupt by invoking all handlers. |
| Please note this checkpoint comes right after checkpoint 20h |
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A1 |
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73