The system bootstrap, initial program load (IPL) and initial
system load (ISL) standard provides a standard interface through
which any Hewlett-Packard Precision Architecture (PA-RISC) computer
can boot any operating system. The
standard also provides a common user interface for booting PA-RISC
systems.
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The following terms are used in this chapter:
- PDC
Refers to processor-dependent code as defined in the System I/O Architectural Control Document (ACD).
- IODC
I/O-dependent code is I/O-device-specific code used to test and
access I/O devices (also defined in the I/O ACD).
- BOOTSTRAP
BOOTSTRAP describes the PDC and IODC functionality needed to bring code
into memory and launch it.
- IPL
Initial program load is the first code brought into the system
and executed from outside the SPU. This code is loaded by the
bootstrap code.
- ISL
Initial system load is a standard code module that is used
during the startup of any operating system to provide a standard user
interface for booting. On some systems, this code may be the IPL,
while on others, IPL may perform some preliminary tasks and then
proceed to load the ISL.
The bootstrap and initial system load are discussed on the following pages.
