Kontron MSM800BEV V101 BIOS - Manual (Page 49)

Geode LX800 / LX900 / BIOS
www.kontron.com 47
7.4 BIOS Diagnostics – Post Codes
This is the GeodeRom port 80 flow for a cold boot on a gx system. There are some additional codes on a scx2xx system.
This shows what functions generate which port 80 code. The first column of codes is generated by xpresrom.asm; the
second column is the function which is run after the post code and any additional post codes generated by that
function.
Kontron Compact Computers LX800 / LX900 Post Codes
Info: Informational code only
Error: Error code. The system halts
Info/Error: Informational code but the system can halt.
Checkpoint Description Type
00h Initialize CS5536 specific registers Info
02h Initialize some cpu registers Info
03h Initialize ES and FS as Big Real Mode segments Info
05h Test CPUID instruction Info
06h
Setup DRAM Memory controller
Detect installed DRAM modules
Detect memory size
Detect memory timing
=> See Post 7xh
Info
07h
Set up a stack for further post tests.
=> See Post 90h, 9Eh, 9Fh
Info
08h
Perform memory test
=> See Post 0Bxh
Info
09h
Copy ROM (F000:0 - F000:FFFF) into SDRAM (F000:0 - F000:FFFF) and disable write access to
shadow memory.
Info
0Bh
Initialize L1 and L2 cache
=> See Post 0CEh
Info
0Ch
Core Logic initialization: Host bridge
Setup GLPCI registers
Enable Clock Gating
Setup AES engine
Apply CPU bugfixes
=> See Post 0E8h
Info
0Dh Platform specific chipset Init Info
0Eh Initialize Super I/O Info
0Fh
PC/AT Compatibility stuff
Initialize DMA controller to AT compatible mode
Clear the first 640kB of memory (to make DOS happy)
Clear 2nd MB of memory (to make DOS happy)
Info
10h
Set up software interrupt vectors
Setup interrupt vectors
Program interrupt controller for PC usage
Initialize Timer
Info
11h store how much memory is available to the OS Info
12h
Decompress ROM images and initialize them
Soft A20
Power Management
Soft VGA
Virtual Audio
SMM system
=> See post 0Dxh
Info
13h
Check for PLL reset and set PLLs if not done already
=> See port 0Axh
Info
14h Wakeup the keyboard controller Info
16h Initialize the BIOS Data Area Info
17h
Scan PCI bus and assign resources
Scan PCI bus for devices
Assign BAR and Interrupt
Info