System Diagnostics
The routine derives the beep code from the test point error as follows:
1. The 8-bit error code is broken down to four 2-bit groups (Discard the most significant
group if it is 00).
2. Each group is made one-based (1 through 4) by adding 1.
3. Short beeps are generated for the number in each group.
Example:
Test point 01Ah = 00 01 10 10 = 1-2-3-3 beeps
The table below lists the checkpoint codes written at the start of each test and the beep codes
issued for terminal errors.
Table 7-2: POST Beep Codes
Code
Beep
POST routine description
02h
Verify Real Mode
03h
Disable Non-Maskable Interrupt (NMI)
04h
Get CPU type
06h
Initialize system hardware
07h
Disable shadow and execute code from the ROM
08h
Initialize chipset with initial POST values
09h
Set in POST flag
0Ah Initialize
CPU
registers
0Bh Enable
CPU
cache
0Ch
Initialize caches to initial POST values
0Eh Initialize
I/O
component
0Fh
Initialize the local bus IDE
10h
Initialize power management
11h
Load alternate registers with initial POST values
12h
Restore CPU control word during warm boot
13h
Initialize PCI bus mastering devices
14h
Initialize keyboard controller
16h
1-2-2-3
BIOS ROM checksum
17h
Initialize cache before memory auto size
18h
8254 timer initialization
1Ah
8237 DMA controller initialization
1Ch
Reset Programmable Interrupt Controller
continued
7-4
HP ProLiant ML110 Server Operations and Maintenance Guide
