4-14
Booting
4.4 Booting Concepts
4.4.1 How Bootblock Booting Works
The boot program reads the primary bootstrap program from the
boot device. The primary bootstrap in turn boots the operating
system.
Figure 4-4
Boot Procedure
Bootblock with boot
driver loads primary
bootstrap into memory
Enter boot command
at the
console prompt
Primary bootstrap
continues booting the
operating system
Boot driver on the
primary processor reads
bootblock from boot device
System may reinitialize
and self-test
is performed
BXB-0026B-92
Boot command specifies boot
device and path to reach it.
Boot driver invoked from console
running on boot processor.
Bootblock contains pointer
to primary bootstrap.
Primary bootstrap loaded into
memory; console transfers
control to primary bootstrap.
Self-test executes and prints if
boot_reset is set on.