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9-60 Vol. 3
PROCESSOR MANAGEMENT AND INITIALIZATION
Figure 9-8. Microcode Update Write Operation Flow [1]
1
Valid Update
Header Version?
Loader Revision Match
BIOS’s Loader?
Does Update Match A
CPU in The System
Write Microcode Update
Does Update
Checksum Correctly?
Yes
Yes
Yes
No
Retu r n
CPU_NOT_PRESENT
N
o
Retu r n
INVALID_HEADER
No
Retu r n
INVALID_HEADER
N
o
Retu r n
INVA LID_H EA DER_ CS