Enabling and disabling the autoboot and autosearch flags determines
one of four boot device and console selections for system initialization.
Hardware interprets the selections as follows:
Manual (autoboot off and autosearch
off). Ask for the path to the boot device. Use the path that is
indicated. Initialize the path given, and boot from it.
Bootsearch (autoboot off and autosearch
on). Search for a boot device. (Devices are searched from the smallest
to the largest physical address on the processor's bus.) If the boot
device has an incorrect data format, search for the next boot device.
If no boot device exists, or all have the incorrect data format,
execute manual selection.
Autoboot (autoboot on and autosearch
off). Try to boot from the primary boot device specified in stable
storage. If the boot device does not exist or has an incorrect data
format, execute manual selection. Once booted, execute (performed
by ISL) an autoboot file, which contains a command sequence, to
bring up the operating system without operator intervention. If
the autoboot file does not exist, prompt the operator for the utility command.
Autosearch (autoboot on and autosearch
on). Try to boot from the boot device path stored in stable storage.
If the boot device does not exist or has an incorrect data format,
execute the boot search selection. Once booted, execute (performed
by ISL) an autoboot file, which contains an autoboot sequence, to
bring up the operating system without operator intervention. If
the autoboot file does not exist, prompt the operator for the utility command.
To enable or disable these features, use the AUTOBOOT and AUTOSEARCH commands. Enter one or both of the commands and
the desired setting (ON/OFF) at the ISL prompt. The system responds with a
message indicating the flag status:
ISL> AUTOBOOT ON
Autoboot is ON (enabled).
ISL> AUTOBOOT OFF
Autoboot is OFF (disabled).
ISL> AUTOSEARCH ON
Autosearch is ON (enabled).
ISL> AUTOSEARCH OFF
Autosearch is OFF (disabled). |
For more information on the autoboot and autosearch flags,
refer to Appendix C “Reading Stable Storage and Nonvolatile
Memory”
Modifying Boot Paths in Stable Storage |
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The ISL commands PRIMPATH, ALTPATH, and CONSPATH are available for placing new primary boot path, alternate
boot path, or console boot path information in stable storage. The
changes need to be in stable storage to execute the autoboot sequence
properly in the event of a power outage or other serious failure.
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 | CAUTION: The commands described in the above paragraph may
disrupt normal system functions if used inappropriately. For this
reason, do not attempt to use these commands without assistance
from Hewlett-Packard service personnel. |
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To execute any of these three commands, enter the command
with its appropriate parameter or enter Return after the command and wait to be prompted for further
input:
or
ISL> ALTPATH
Enter alternate boot path: 0/0/1/0.6 |
To withdraw a command (without changing the path), enter Return after entering the command without any parameter. For
example,
ISL> ALTPATH
Enter alternate boot path: Return
Invalid Input. |
Trailing zeros are not required when a boot path is entered:
ISL> PRIMPATH primpath 0/0/2/0.6.0.0
ISL> CONSPATH 0/0/4/0 |
If an improper path format is entered, or you have withdrawn
a command as shown above, the system issues an Invalid Input message. Then ISL prompts for a new command:
ISL> PRIMPATH 240
Invalid Input. |
Displaying Current Boot Path, Autoboot, and Autosearch
Settings |
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Since an improper path keeps the system from booting, use
the DISPLAY command to check the paths entered. Double check
these entries against a recent I/O map from the ISL IOMAP utility or a configuration listing from the SYSGEN
utility. For more information on SYSGEN, refer to Chapter 4 “Using the System Generator (SYSGEN)”
The DISPLAY or DI command lists the autoboot and autosearch settings, the
primary boot path, the alternate boot path, and the system console
path held in stable storage. Use the DISPLAY command to verify that correct information resides in
stable storage. Example 3-3 demonstrates using the ISL DISPLAY command. This is an example from a N-class system. The
boot paths may vary, depending on the system.
Example 3-3 Displaying an Example of ISL Settings
ISL> display Fastsize value is 0000000F Autoboot is OFF (disabled) Autosearch is OFF (disabled) Primary boot path is 0/0/2/0.6.0.0.0.0.0
Primary boot path is (hex) 0/0/2/0.6.0.0.0.0.0 Alternate boot path is 0/0/1/0.6.0.0.0.0.0
Alternate boot path is (hex) 0/0/1/0.6.0.0.0.0.0 System console path is 0/0/4/0.0.0.0.0.0.0
System console path is (hex) 0/0/4/0.0.0.0.0.0.0ISL> |
Setting Fastsize |
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If fastsize is set to the wrong value, you cannot do installs
or updates. The only value that is acceptable is "F." If
you try to do an update or install with fastsize set to the wrong
value, you will receive an error message that reads UTILITY REQUIRES MORE MEMORY THAN IS CONFIGURED.
Consider the following example.
ISL> DISPLAY
Fastsize value is 00000003
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.
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This fastsize value is invalid. You must reset it to "F";
therefore, at the ISL prompt, enter Fastsize F, as in the following example.
If you changed the value of fastsize, you must reset the system
for the new value to take effect. For more information on resetting
the system, refer to Chapter 2 “Initiating System Activity”
Listing Autoboot File Contents |
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To list the contents of the current autoboot file, enter either LISTAUTOFL or LSAUTOFL at the ISL prompt:
Printable version
