HP Visualize J2240 Service Handbook page 224

Stable Storage
Stable storage is nonvolatile memory associated with each PA–RISC processor mod-
ule. Stable storage is used by the processor (CPU) to store the following:
D
Device path information
D
The state of the boot flags
D
HPMC error information
D
Operating system initialization data
ISL Environment
The ISL environment provides the means to load the operating system (HP–UX)
environment. The ISL environment also provides an offline platform to execute diag-
nostic and utility programs from a boot device when HP–UX does not load.
The ISL program is the first program loaded into main memory from an external
media (LAN, disk, or tape) and launched by the initial program loader (IPL) routine
from the Boot Administration environment.
The ISL environment provides the following capabilities:
D
Execute user–entered commands to modify boot device paths and boot options
in stable storage
D
Run offline diagnostic programs and utilities
D
Provide automatic booting of the HP–UX O/S after power–on or reset
10–22 Boot Console