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Chapter 4
Firmware (OBP and PDC)
Boot sequence
Boot sequence
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 46 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 the HP
Diagnostics Guide: S-Class, X-Class, and V-Class 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.
Figure 11 on page 43 illustrates the initialization and start-up process.
Summary of Contents for 9000 V-Class
Page 4: ......
Page 10: ...x List of Tables ...
Page 12: ...xii List of Figures ...
Page 26: ...12 Chapter1 Overview Shared memory ...
Page 66: ...52 Chapter4 Firmware OBP and PDC HElp command ...
Page 112: ...98 Chapter7 Recovering from failures Abnormal system shutdowns ...
Page 116: ...102 Index X X tool menu 30 ...