Board:via/epia: Difference between revisions
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The values for MA map type refer to bits 15-13, 7-5, and 3-1 of offset 0x59-0x58 of the VT8601A host bridge. See the VT8601/PLE133 data sheet for details. All values other than 0xx and 100 are documented as "reserved (do not program)" | The values for MA map type refer to bits 15-13, 7-5, and 3-1 of offset 0x59-0x58 of the VT8601A host bridge. See the VT8601/PLE133 data sheet for details. All values other than 0xx and 100 are documented as "reserved (do not program)" | ||
{| border="1" | {| border="1" | ||
|+ Values determined by testing various modules with the factory BIOS. | |||
!DIMM size!!Row Density (SPD 31)!!Width (SPD 13)!!Rows(SPD 5)!!MA map type | !DIMM size!!Row Density (SPD 31)!!Width (SPD 13)!!Rows(SPD 5)!!MA map type | ||
|- | |- | ||
Revision as of 16:26, 9 May 2007
Current problems:
- MA map type is set incorrectly for some types of DIMM. In progress
- some memory errors persist even once the MA map type is set correctly; This may be caused by LB passing an incorrect e820 memory map.
MA Map Types
The values for MA map type refer to bits 15-13, 7-5, and 3-1 of offset 0x59-0x58 of the VT8601A host bridge. See the VT8601/PLE133 data sheet for details. All values other than 0xx and 100 are documented as "reserved (do not program)"
| DIMM size | Row Density (SPD 31) | Width (SPD 13) | Rows(SPD 5) | MA map type |
|---|---|---|---|---|
| 512MB | 256MB | 8 | 2 | 0xe (111) |
| 256MB | 128MB | 16 | 2 | 0xc (110) |
| 128MB | 128MB | 16 | 1 | 0xc (110) |
| 128MB | 64MB | 8 | 2 | 0x8 (100) |
| 64MB | 64MB | 8 | 1 | 0x8 (100) |