Error Messages and Beep Codes
75
Table 42. Port 80h POST Codes
POST Code Description of POST Operation
Host Processor
10 Power-on initialization of the host processor (Boot Strap Processor)
11 Host processor cache initialization (including APs)
12 Starting Application processor initialization
13 SMM initialization
Chipset
21 Initializing a chipset component
Memory
22 Reading SPD from memory DIMMs
23 Detecting presence of memory DIMMs
24 Programming timing parameters in the memory controller and the DIMMs
25 Configuring memory
26 Optimizing memory settings
27 Initializing memory, such as ECC init
28 Testing memory
PCI Bus
50 Enumerating PCI busses
51 Allocating resources to PCI bus
52 Hot Plug PCI controller initialization
53 – 57 Reserved for PCI Bus
USB
58 Resetting USB bus
59 Reserved for USB
ATA/ATAPI/SATA
5A Resetting PATA/SATA bus and all devices
5B Reserved for ATA
SMBus
5C Resetting SMBus
5D Reserved for SMBus
Local Console
70 Resetting the VGA controller
71 Disabling the VGA controller
72 Enabling the VGA controller
Remote Console
78 Resetting the console controller
79 Disabling the console controller
7A Enabling the console controller
continued
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