Difference between revisions of "EPIA"
From coreboot
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==Current problems== | ==Current problems== | ||
| − | * Mixing of memory widths appears to cause memory errors. The 256MB and 64MB DIMM from the table below show memory errors when installed together. | + | * Mixing of memory widths appears to cause memory errors. The 256MB and 64MB DIMM from the table below show memory errors when installed together. Single-row memory might also be a problem, as the 128M single-row module gives errors. Double-row memory might also be a problem, as the 256M gives errors. |
* shutting down system does not turn off power. | * shutting down system does not turn off power. | ||
* Hangs at ram detection. Patch available 2007-06-04 | * Hangs at ram detection. Patch available 2007-06-04 | ||
| + | |||
==Previous problems== | ==Previous problems== | ||
* MA map type is set incorrectly for some types of DIMM. Fixed as of r2653. | * MA map type is set incorrectly for some types of DIMM. Fixed as of r2653. | ||
Revision as of 20:45, 4 June 2007
Current problems
- Mixing of memory widths appears to cause memory errors. The 256MB and 64MB DIMM from the table below show memory errors when installed together. Single-row memory might also be a problem, as the 128M single-row module gives errors. Double-row memory might also be a problem, as the 256M gives errors.
- shutting down system does not turn off power.
- Hangs at ram detection. Patch available 2007-06-04
Previous problems
- MA map type is set incorrectly for some types of DIMM. Fixed as of r2653.
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) |
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