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7-documentation/boot.doc
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This document describes the changes made to BOOT since TOPS-20 V5,
including all changes made for TOPS-20 V6 and V6.1.
BOOT.DOC -- Changes to BOOT [version 10(201)]
September 1984
COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1976, 1984.
ALL RIGHTS RESERVED.
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND
COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH
THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR
ANY OTHER COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE
AVAILABLE TO ANY OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE
SOFTWARE IS HEREBY TRANSFERRED.
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT
NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL
EQUIPMENT CORPORATION.
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF
ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
Changes to BOOT [version 10(201)] Page 2
1.0 NEW FUNCTIONALITY
The following new functions have been added to BOOT:
1. Subdirectory handling. BOOT will now load/dump
from/to a subdirectory.
2. Dual-port unlocking. Previously, BOOT would
unconditionally grab a dual-ported RP04567 and not
release it until the load or dump was completed.
Now, it is more polite, locking and unlocking the
port for each IO transaction. This allows the
other system to access the device when the port is
unlocked. In particular, one can now interrupt a
load or dump in progress with ^\ and get to the
RSX20F parser. A single ^\ is sufficient (it
requires about 2-4 seconds to receive the parser
prompt).
3. Single-pass loading. BOOT will perform only a
single pass to load release 6 monitors. It will
still perform a 2-pass load on pre-release 6
monitors.
4. Long-file handling. BOOT can now load a monitor
containing more than 512 pages.
[End BOOT.DOC]
COPYRIGHT (C) 1976,1978,1979,1980,1981,1982,1983,1984,1985 BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
TRANSFERRED.
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
CORPORATION.
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
Changes to BOOT [version 11(306)] Page 2
1.0 INTERNAL CHANGES TO BOOT V11
This new version of BOOT contains no new functionality.
The changes that have been made are in the area of disk I/O.
The I/O code has been rewritten to allow BOOT to write more
than one page per I/O request, and to allow simultaneous I/O
acrosss different channels when BOOT writes to a multi-pack
structure.
The routine that writes the dump file has been
rewritten to take advantage of the changes in the I/O code.
This routine scans the dump file's index block and writes
out as many pages as it finds that are contiguous on the
disk in one call to the disk I/O code. These changes have
realized a considerable decrease in BOOT's dumping time.
2.0 EXTERNAL CHANGES TO BOOT V11
After BOOT has successfully written the dump file, it
prints out two pieces of information. It prints the number
of pages written to the file (not including the file's
directory page). It also prints out the number of I/O
requests needed to write the file. The more contiguous the
DUMP.EXE file is, the lower this number will be (and
therefore the faster the DUMP.EXE file will be written). In
order to make the file as contiguous as possible, a refresh
of the structure can be done, where the DUMP.EXE file is the
first file created after all of the files on the structure
have been deleted and expunged.
Another observable change is that the DUMP.CPY file is
now about 20 to 30 pages larger than it used to be. This is
the file created by SETSPD when it copies the DUMP.EXE file.
The old BOOT used to compress the DUMP.EXE file as it wrote
it. The new BOOT writes each physical page to it's
corresponding virtual page in the file (plus one to allow
for the directory page). Although the DUMP.CPY file is
larger, FILDDT will NOT map any pages from the file that
were not in memory at the time the DUMP.EXE file was
written.
3.0 RESTRICTIONS
This BOOT will NOT load any 6.0 monitors. In general,
it will not load any monitor that has been built with symbol
A%POST (in POSTLD) greater than 745000. It will load the
distributed (and autopatch) 5.1 and 6.1 monitors
Changes in BOOT version 11(311)
The behavior of BOOT with respect to errors during the dump phase of
an autoreload has been restored to the behavior during TOPS20 V5:
errors during the dump will not abort the autoreload (and cause BOOT
to return to prompt level). This is now the default action for 6.1.
However, some sites may be very anxious to capture a particular dump
and would want an error during the dump phase to abort the
autoreload (and provide a possible opportunity to correct the
problem and try the dump again). BOOT now reads flags from the
homeblock of the bootable structure, and said flags will control its
behavior relative to errors encountered during the dump-phase of an
autoreload.
CHECKD now modifies and displays these flags (parameters):
ENABLE BOOT-PARAMETERS (for structure) PS: (parameter)
READ BOOT-PARAMETERS !Instructs BOOT to read the parameter word
HALT-ON-DUMP-ERRORS !Instructs BOOT to halt the autoreload on a
!dump-error and return to prompt level
DISABLE BOOT-PARAMETERS .....
Note that if READ-PARAMETERS is disabled (the default condition on
any structure), BOOT will not read the parameter word. If the
parameters are enabled, the heading of BOOT messages will change
from "[BOOT:" to "[*BOOT: ", with the asterisk indicating that the
parameter word was read.
The following CHECKD command will display the state of the parameter
word:
SHOW BOOT-PARAMETERS (for structure) PS: