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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

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