Abstract: Duronprocessor, revision (CPUID 630) contains erratum that w
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DuronProcessor Rev. CPUID Reporting Cache Size
Abstract: Duronprocessor, revision (CPUID 630) contains erratum that will result incorrect reporting internal cache size CPUID extended function 8000_0006h used. BIOS other utility uses this instruction when reporting cache size, then recommended that BIOS utility adjust return value from this instruction described below "Solution." more information, refer the:
DuronProcessor Revision Guide, order# 23865 Processor Recognition Application Note, order# 20734 Athlonand DuronProcessors Recognition Addendum, order# 21922.
Description:
When CPUID extended function 8000_0006h used obtain cache information, Duron processor rev. (CPUID 630) reports cache size incorrectly. Consider code below executing CPUID extended function 8000_0006h:
CPUID eax, 80000006h ;CPUID 80000006h ;ecx[31:16] size info ecx, size either 64KB)
Solution:
CPUID determine cache size Duron processor. Instead following code:
Check CPUID revision Duron(tm) processor eax, ;CPUID version information 0630h Duron processor? ;(assume yes) YES-L2 size NO-use CPUID function size eax, 80000006h ;CPUID 80000006h ;ecx[31:16] size info ecx, ;Shift size bits into
CPUID
@@:;cx size
Trademarks-AMD, logo, Athlon, Duron, combinations thereof, trademarks Advanced Micro Devices, Inc.
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