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SE7221BK1-E Technical Product Specification
65
Diagnostic LED
Decoder
G=Green, R=Red,
A=Amber
Hi Low
Description
15h Off G Off A
Pass control to the uncompressed code in shadow RAM. The initialization code
is copied to segment 0 and control will be transferred to segment 0.
16h Off G G R
Control is in segment 0. Verify the system BIOS checksum.
If the system BIOS checksum is bad, go to checkpoint code E0h.
Otherwise, going to checkpoint code D7h.
17h Off G G A Pass control to the interface module.
18h G Off Off R Decompress of the main system BIOS failed.
19h G Off Off A Build the BIOS stack. Disable USB controller. Disable cache.
1Ah G Off G R Uncompress the POST code module. Pass control to the POST code module.
1Bh A R Off R Decompress the main system BIOS runtime code.
1Ch A R Off A Pass control to the main system BIOS in shadow RAM.
E0h R R R Off
Start of recovery BIOS. Initialize interrupt vectors, system timer, DMA controller,
and interrupt controller.
E8h A R R Off Initialize extra module if present.
E9h A R R G Initialize floppy controller.
Eah A R A Off Try to boot floppy diskette.
Ebh A R A G If floppy boot fails, intialize ATAPI hardware.
Ech A A R Off Try booting from ATAPI CD-ROM drive.
Eeh A A A Off Jump to boot sector.
Efh A A A G Disable ATAPI hardware.
Table 77. POST Progress Codes
Diagnostic LED
Decoder
G=Green, R=Red,
A=Amber
Hi Low
Description
20h Off Off R Off Uncompress various BIOS Modules
22h Off Off A Off Verify password Checksum
24h Off G R Off Verify CMOS Checksum.
26h Off G A Off Read Microcode updates from BIOS ROM.
28h G Off R Off
Initializing the processors. Set up processor registers. Select least featured
processor as the BSP.
2Ah G Off A Off Go to Big Real Mode
2Ch G G R Off Decompress INT13 module
2Eh G G A Off
Keyboard Controller Test: The keyboard controller input buffer is free. Next,
issuing the BAT command to the keyboard controller
30h Off Off R R Keyboard/Mouse port swap, if needed
32h Off Off A R
Write Command Byte 8042: The initialization after the keyboard controller BAT
command test is done. The keyboard command byte will be written next.