Intel D845PEBT2 Product Specification - Page 122

Table 92., Runtime Code Uncompressed in F000 Shadow RAM

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Intel Desktop Board D845PEBT2 Technical Product Specification Table 92. Runtime Code Uncompressed in F000 Shadow RAM Code 03 05 06 07 08 0B 0C 0E 0F 10 11 12 13 14 19 1A 23 24 25 27 28 2A 2B 2C 2D 2E 2F 30 31 32 34 37 38 39 3A Description of POST Operation NMI is Disabled. To check soft reset/power-on. BIOS stack set. Going to disable cache if any. POST code to be uncompressed. CPU init and CPU data area init to be done. CMOS checksum calculation to be done next. Any initialization before keyboard BAT to be done next. KB controller I/B free. To issue the BAT command to keyboard controller. Any initialization after KB controller BAT to be done next. Keyboard command byte to be written. Going to issue Pin-23,24 blocking/unblocking command. Going to check pressing of , key during power-on. To init CMOS if "Init CMOS in every boot" is set or key is pressed. Going to disable DMA and Interrupt controllers. Video display is disabled and port-B is initialized. Chipset init about to begin. 8254 timer test about to start. About to start memory refresh test. Memory Refresh line is toggling. Going to check 15 µs ON/OFF time. To read 8042 input port and disable Megakey GreenPC feature. Make BIOS code segment writeable. To do any setup before Int vector init. Interrupt vector initialization to begin. To clear password if necessary. Any initialization before setting video mode to be done. Going for monochrome mode and color mode setting. Different buses init (system, static, output devices) to start if present. (See Section 5.3 for details of different buses.) To give control for any setup required before optional video ROM check. To look for optional video ROM and give control. To give control to do any processing after video ROM returns control. If EGA/VGA not found then do display memory R/W test. EGA/VGA not found. Display memory R/W test about to begin. Display memory R/W test passed. About to look for the retrace checking. Display memory R/W test or retrace checking failed. To do alternate Display memory R/W test. Alternate Display memory R/W test passed. To look for the alternate display retrace checking. Video display checking over. Display mode to be set next. Display mode set. Going to display the power-on message. Different buses init (input, IPL, general devices) to start if present. (See Section 5.3 for details of different buses.) Display different buses initialization error messages. (See Section 5.3 for details of different buses.) New cursor position read and saved. To display the Hit message. continued 122

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Intel Desktop Board D845PEBT2 Technical Product Specification
122
Table 92.
Runtime Code Uncompressed in F000 Shadow RAM
Code
Description of POST Operation
03
NMI is Disabled.
To check soft reset/power-on.
05
BIOS stack set.
Going to disable cache if any.
06
POST code to be uncompressed.
07
CPU init and CPU data area init to be done.
08
CMOS checksum calculation to be done next.
0B
Any initialization before keyboard BAT to be done next.
0C
KB controller I/B free.
To issue the BAT command to keyboard controller.
0E
Any initialization after KB controller BAT to be done next.
0F
Keyboard command byte to be written.
10
Going to issue Pin-23,24 blocking/unblocking command.
11
Going to check pressing of <INS>, <END> key during power-on.
12
To init CMOS if "Init CMOS in every boot" is set or <END> key is pressed.
Going to disable DMA
and Interrupt controllers.
13
Video display is disabled and port-B is initialized.
Chipset init about to begin.
14
8254 timer test about to start.
19
About to start memory refresh test.
1A
Memory Refresh line is toggling.
Going to check 15 μs ON/OFF time.
23
To read 8042 input port and disable Megakey GreenPC feature.
Make BIOS code segment
writeable.
24
To do any setup before Int vector init.
25
Interrupt vector initialization to begin.
To clear password if
necessary.
27
Any initialization before setting video mode to be done.
28
Going for monochrome mode and color mode setting.
2A
Different buses init (system, static, output devices) to start if present.
(See Section 5.3 for details
of different buses.)
2B
To give control for any setup required before optional video ROM check.
2C
To look for optional video ROM and give control.
2D
To give control to do any processing after video ROM returns control.
2E
If EGA/VGA not found then do display memory R/W test.
2F
EGA/VGA not found.
Display memory R/W test about to begin.
30
Display memory R/W test passed.
About to look for the retrace checking.
31
Display memory R/W test or retrace checking failed.
To do alternate Display memory R/W test.
32
Alternate Display memory R/W test passed.
To look for the alternate display retrace checking.
34
Video display checking over.
Display mode to be set next.
37
Display mode set.
Going to display the power-on message.
38
Different buses init (input, IPL, general devices) to start if present.
(See Section 5.3 for details of
different buses.)
39
Display different buses initialization error messages.
(See Section 5.3 for details of different
buses.)
3A
New cursor position read and saved.
To display the Hit <DEL> message.
continued