Board:via/epia

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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 (SPD index) Row Density (31) Width (13) Rows(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)