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60 Chapter 4
Firmware (OBP and PDC)
Boot sequence
Boot sequence
OpenBoot PROM (OBP) and SPP Processor Dependent Code (SPP_PDC)
make up the firmware on HP V-Class servers that makes it possible to
boot HP-UX.
Once a machine powers on, the firmware controls the system until the
operating system (OS) executes. If the system encounters an error any
time during the boot process, it stops processing and goes to HP mode
boot menu. See “HP mode boot menu” on page 64 for more information.
When the operator powers on or resets the machine, the following
process occurs:
1. Power-On Self Test (POST) runs. POST is described in “LCD (Liquid
Crystal Display)” on page 28 and in the HP Diagnostics Guide:
V2500/V2600 Servers.
2. OBP probes all the devices.
3. OBP loads SPP_PDC in RAM.
4. OBP starts the HP-UX loader, which in turns calls SPP_PDC to set
up CPU’s, memory, and I/O devices in a way that HP-UX
understands.
5. The next action depends on whether Autoboot is enabled.
1. If autoboot is enabled, the operating system boots unless the user
presses a key within 10 seconds.
2. If autoboot is disabled or if the user presses a key within 10
seconds, the boot menu is displayed. For further information see,
“Enabling Autoboot” on page 67.
Figure 24 on page 61 illustrates the initialization and start-up process.