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35 Chapter 4
Post Checkpoints List: The list may vary accordingly depending on your BIOS
Checkpoint Description
CFh Test CMOS R/W functionality
C0h Early chipset initialization: -Disable shadow RAM
-Disable L2 cache (socket 7 or below) -Program basic chipset registers
C1h Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache (socket 7 or below)
C3h Expand compressed BIOS code to DRAM
C5h Call chipset hook to copy BIOS back to E000 & F000 shadow RAM.
01h Expand the Xgroup codes locating in physical address 1000:0
02h Reserved
03h Initial Superio_Early _Init switch
04h Reserved
05h 1. Blank out screen
2. Clear CMOS error flag
06h Reserved
07h 1. Clear 8042 interface
2. Initialize 8042 self-test
08h 1. Test special keyboard controller for Winbond 977 series Super I/O chips. 2. Enable
keyboard interface.
09h Reserved
0Ah 1. Disable PS/2 mouse interface (optional)
2. Auto detect ports for keyboard & mouse followed by a port & interface swap (optional).
3. Reset keyboard for Winbond 977 series Super I/Q chips.
0Bh Reserved
0Ch Reserved
0Dh Reserved
0Eh Test F000h segment shadow to see whether it is R/W-able or not. If test fails, keep beeping
the speaker.
0Fh Reserved
10h Auto detect flash type to load appropriate flash R/W codes into the run time area in F000
for ESCD & DMI support.
11h Reserved
12h Use walking 1??s algorithm to check out interface in CMOS circuitry. Also set real-time
clock power status, and then check for override.
13h Reserved