Specifications

66 Product Errata
41322 Rev. 3.84 August 2011
Revision Guide for AMD Family 10h Processors
300 Hardware Memory Clear Is Not Supported After Software DRAM
Initialization
Description
When using software-controlled DRAM device initialization using EnDramInit (F2x[1, 0]7C DRAM
Initialization Register[31]), hardware memory clear using MemClrInit (F2x110 DRAM Controller
Select Low Register[3]) does not function.
Potential Effect on System
After BIOS sets MemClrInit (F2x110[3]), the hardware will not clear memory and will not set
MemCleared (F2x110[10]). The BIOS will hang waiting for the operation to complete.
Suggested Workaround
BIOS should use hardware initialization of DRAM using InitDram (F2x[1, 0]90 DRAM
Configuration Low Register[0]). If BIOS uses software initialization, alternative methods to initialize
ECC must be used.
Fix Planned
Yes