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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
diagnostic 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 (L~~
disk. or tape) and launched by the initial program loader
(IPL) routine during the Boot Administration environment.
The ISL environment provides the following capabilities:
. Execute user– entered commands to modify boot device paths and boot
options in stable storage.
.
Run off–line diagnostic programs (MULTIDIAG, IOMAP).
. Provide automatic booting of the HP – UX 0/S after power—on or reset.
The ISL program provides a standalone environment for loading offline diagnostic
and utility programs from the LIF directory. The ISL program also provides user
commands to configure the boot parameters into Stable Storage.
ISL User Commands
There are several commands available in the ISL environment that allow a user to
obtain information about the boot characteristics of the system or to modify these
characteristics.
display – displays the boot and console paths in Stable Storage and to
determine the current setting of the ISL Boot Flags.
&
PrimPath _ modifies the primary boot path entry in Stable Storage. The
entry in Stable Storage for the primary boot device begins at byte address
Oand ends at byte address51.
altpath – modifies the alternate boot path entry in Stable Storage. The
entry for the alternate boot device begins at byte address 128 and ends at
159.
conspath – modifies the console path entry in Stable Storage. The entry
in Stable Storage for the console device begins at byte address 96 and
ends at byte address 127. The entry for the keyboard and mouse devices
begins at byte address 160 and ends at 191.
listautofl or lsautofl – lists the contents of the (HP–UX)
autoboot file.
.
support – boots the Support Tape from the boot device.
readss – displays 4 bytes (one word) from Stable Storage. The readss
command requires a decimal number between Oand 255 to address four
bytes in Stable Storage.
Troubleshooting
4-17
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