BIOS
3.15 BIOS memory mapping
Address Device | Description |
E000:0000h - F000:FFFFh | System BIOS Area |
D000:2000h - D000:FFFFh | Free space |
D000:0000h - D000:1FFFh | LAN ROM |
C000:E000h - CF00:FFFFh | Free space |
C000:0000h - C000:DFFFh | VGA BIOS |
A000:0000h - B000:FFFFh | VGA RAM |
0000:0000h - 9000:FFFFh | DOS 640K |
3.16 Award BIOS Post Codes
CFh | Test CMOS read/write functionality |
C0h | Early chipset initialization: Disable shadow RAM, L2 cache |
| (socket 7 and below), program basic chipset registers |
C1h | Detect memory: Auto detection of DRAM size, type and ECC, auto |
| detection of L2 cache (socket 7 and 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 located in physical memory address |
| 1000:0 |
02h | Reserved |
03h | Initial Superio_Early_Init switch |
04h | Reserved |
05h | Blank out screen; Clear CMOS error ?ag |
06h | Reserved |
07h | Clear 8042 interface; Initialize 8042 self test |
08h | Test special keyboard controller for Winbond 977 series Super I/O |
| chips; Enable keyboard interface |
09h | Reserved |
0Ah | Disable PS/2 mouse interface (optional); Auto detect ports for |
| keyboard & mouse followed by a port & interface swap (optional); |
| Reset keyboard for Winbond 977 series Super I/O chips |
0Bh | Reserved |
0Ch | Reserved |
0Dh | Reserved |
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