Asus PRL-DLS PRL-DLS User Manual - Page 56

Port 80h post code LEDs

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2.9.1 Port 80h post code LEDs LED 8 7 6 5 4 3 2 1 FFh C0h 0Dh 00h POST Code < C0h > 1. Chipset very early initialization. 2. Programed chipset registers before memory detection. POST Code < C1h > 1. Power on check. 2. Memory detection and initialization. POST Code < 80h > : Get memory type from SPD. If BIOS can't get SPD = Error Code < D0h > If memory type is not DDR-SDRAM = Error Code < D8h > POST Code < 81h > : Get size and timing information from SPD. POST Code < 82h > : Set memory size according to each memory module. POST Code < 83h > : Set memory timing. POST Code < 84h > : Initialize memory module. POST Code < 85h > : Do DQS for memory module. POST Code < 86h > : Finish memory detection and initialization 3. Test first 256 MB memory. POST Code < 0Ch > 1. BIOS checksum verify. POST Code < C3h > 1. Decompressed BIOS codes into memory. POST Code < C5h > 1. Shadow system BIOS. 2-28 Chapter 2: Hardware information

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2-28
Chapter 2: Hardware information
2.9.1
Port 80h post code LEDs
8
7
6
5
4
3
2
1
FFh
C0h
0Dh
00h
LED
POST Code < C0h >
1.
Chipset very early initialization.
2.
Programed chipset registers before memory detection.
POST Code < C1h >
1.
Power on check.
2.
Memory detection and initialization.
POST Code < 80h > : Get memory type from SPD.
If BIOS can’t get SPD =
Error Code < D0h >
If memory type is not DDR-SDRAM =
Error Code < D8h >
POST Code < 81h > : Get size and timing information from SPD.
POST Code < 82h > : Set memory size according to each memory module.
POST Code < 83h > : Set memory timing.
POST Code < 84h > : Initialize memory module.
POST Code < 85h > : Do DQS for memory module.
POST Code < 86h > : Finish memory detection and initialization
3.
Test first 256 MB memory.
POST Code < 0Ch >
1.
BIOS checksum verify.
POST Code < C3h >
1.
Decompressed BIOS codes into memory.
POST Code < C5h >
1.
Shadow system BIOS.