On tape boots, the ISL is loaded directly by the
processor-dependent code (PDC). ISL reads the
logical interchange format (LIF) directory from tape and uses this directory to find other files on the tape.
On disk boots, the PDC and IODC boot the utility MMSAVE, which in turn boots the ISL. PDC and IODC read the first record or sector of the boot device, which is the LIF label. The LIF label contains a pointer to the MMSAVE boot image. PDC reads and launches
MMSAVE. MMSAVE writes a 16-megabyte section of main memory to the DUMPAREA file, whose address is found in the LIF directory. This allows memory space for the ISL and DUMP utilities to be loaded. MMSAVE boots ISL, which then uses the LIF label to find the LIF directory. As a last step, ISL uses the directory to find other files it needs.
The system displays messages indicating the completion of the booting and loading routines as they occur.
Using initial system loader (ISL) commands |
 |
ISL commands change or display boot path information and ISL utility names. Table 3-1 “ISL Commands.” lists commands that do not execute a utility function. ISL utilities and options are described later in this chapter.
Table 3-1 ISL Commands.
| Command | Meaning |
|---|
| HELP or ? | Lists ISL commands and definitions, along
with the ISL utilities available through the selected boot media. |
| LISTF or LS | Lists the ISL utilities available through the selected
boot media. |
| AUTOBOOT | Sets or clears the autoboot flag in stable storage.
(Stable storage is memory that retains its information until
overwritten. Stable storage stores boot path information along with other critical system parameters.) |
| AUTOSEARCH | Sets or clears the autosearch flag in stable storage. |
| PRIMPATH | Modifies the primary boot path in stable storage. |
| ALTPATH | Modifies the alternate boot path in stable storage. |
| CONSPATH | Modifies the system console boot path in stable
storage. |
| DISPLAY or DI | Displays the current paths in stable storage for
the primary, alternate, and the console boot paths.
DISPLAY also shows the status of the autoboot and
autosearch flags. |
| LISTAUTOFL or LSAUTOFL | Lists the contents of the current autoboot file. |
| FASTSIZE | Sets or displays FASTSIZE. |
| SUPPORT | Boots the support tape from the boot device. |
| READNVM | Displays the contents of 1 word (4 bytes) of nonvolatile memory (NVM). (NVM is memory that retains its information, in standard hexadecimal format, until overwritten.) Specify the word address in either decimal or hexadecimal. |
| READSS | Displays the contents of 1 word (4 bytes) of stable storage. Specify the word address in either decimal or hexadecimal. The display is in standard hexadecimal format. |
For more information on the contents of stable storage and NVM, refer to Appendix C “Reading Stable Storage and Nonvolatile Memory”.
Listing Available ISL Utilities |
|
Example 3-2 demonstrates using the ISL LISTF command to
display available ISL utilities. To generate a list of the
utilities available on the boot medium, enter LISTF or
LS at the ISL prompt.
Example 3-2 Listing Available ISL Utilities
ISL> LISTF
Utilities on this system are:
filename type start size created
====================================================
START -12864 992896 27208 89/11/37 10:34:44
SAT -12864 481344 25528 89/11/37 08:25:51
ISL -12864 419936 152 89/11/37 08:25:27
DISCUTIL -12864 463872 17464 89/11/37 08:25:36
DUMP -12864 963904 16424 89/11/37 09:44:12
ISL -12864 419936 152 89/11/37 08:25:27
A1002AI -12864 480256 544 89/11/28 16:21:50
A1002AM -12864 480800 408 89/11/28 16:21:51
A1002AP -12864 481216 4600 89/11/28 16:21:54
A1100AI -12864 485824 856 89/11/28 16:21:54
A1100AM -12864 486688 496 89/11/28 16:21:55
A1100AP -12864 487184 3400 89/11/28 16:21:58
EDBC -12864 537024 2080 94/11/53 16:43:49
EDPROC -12864 539104 8848 94/11/53 16:43:55
LASIDIAG -12864 516688 752 94/11/53 16:43:56
LDIAG -12864 517440 5808 94/11/53 16:44:00
MAPFILE -12864 421600 16 94/11/53 16:44:00
MAPPER -12864 523248 336 94/11/53 16:44:01
MDIAG -12864 523584 6240 94/11/53 16:44:05
MEMTEST -12864 421616 321 94/11/53 16:44:05
MPROC -12864 447760 1408 94/11/53 16:44:07
ODE -12864 421936 432 94/11/53 16:44:07
SYSLIB -12864 422368 688 94/11/53 16:44:08
TDIAG -12864 529824 7200 94/11/53 16:44:13
UNIPROC -12864 453504 4464 94/11/53 16:44:16
BCDIAG -12864 423056 960 94/11/53 16:44:17
CAEXR -12864 444720 672 94/11/53 16:44:18
IOMAP -12864 445392 1536 94/11/53 16:44:19
CLKUTIL -12864 424016 312 94/11/53 16:44:20
SADPATCH -12864 446928 832 94/11/53 16:44:20
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