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PDP-10 Archives
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tops20_v6_1_tcpip_distribution_tp_ft6
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6-1-documentation/boot.tco
There are 25 other files named boot.tco in the archive. Click here to see a list.
TCO-number: 6.1495
Written-by: WACHS Creation-date: 4-Feb-83 05:03:11
Edited-by: LEACHE Edit-date: 25-Apr-84 14:44:34
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: Yes
Program: Monitor
Routines-affected: BOOT
Problem: BOOT wipes out KLIPA/KLNI microcode
Diagnosis: DATAO/DATAI to read drive type register writes the
microcode.
Solution: test CONI bits. If bits 0,16, and 17 are on then don't
read the drive type register
[End of TCO 6.1495]
TCO-number: 6.1498
Written-by: LEACHE Creation-date: 9-Feb-83 17:21:47
Edited-by: PURRETTA Edit-date: 25-Apr-84 15:03:16
Edit-checked: No Document: Yes TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: MONITOR
Routines-affected: BOOT
Problem: BOOT is very sensitive to transient IO errors.
Diagnosis: Unlike the monitor, BOOT does not have error-correction logic and
head-repositioning logic.
Solution: 1. Up the IO retry count from 5 to 15.
2. On an IO error, display the channel status, drive status, and the
contents of drive error-registers one and two.
3. When an IO error occurs during a dump, print out the page number(s)
on which the error(s) occurred.
[End of TCO 6.1498]
TCO-number: 6.1549
Written-by: WACHS Creation-date: 16-Mar-83 04:08:27
Edited-by: PURRETTA Edit-date: 25-Apr-84 15:07:21
Edit-checked: No Document: Yes TCO-tested: No
Maintenance-release: No Hardware-related: Yes
Program: MONITOR
Routines-affected: BOOT
Problem: BOOT doesn't load the KLIPA or KLNI microcode
Diagnosis: no code
Solution: Add code to load them
[End of TCO 6.1549]
TCO-number: 6.1969
Written-by: LEACHE Creation-date: 15-Feb-84 10:03:33
Edited-by: LEACHE Edit-date: 7-Mar-84 11:47:13
Edit-checked: No Document: Yes TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: MONITOR
Routines-affected: BOOT MTBOOT MEXEC PAGUTL
Problem: -
In order to make room in MONITOR.EXE, some PSECTS are now relocated
above the first 256K in the EXE core-image. BOOT must be taught to
load these PSECTS above its own core-image into physical memory above
the first 256K.
Diagnosis: -
As above
Solution: -
Change BOOT to load DDT and the swappable monitor into physical memory
above the first 256K.
This change will require contiguous physical memory of 512K in order
to boot the monitor.
With this change, BOOT will load V6 (or later) monitors in one pass.
Since the swappable monitor is now in section 1 of the .EXE file,
mapping games must be played in order to patch MONITR.EXE under
timesharing. The mapping is transparent to the user, and so the
monitor is patched as always:
@GET MONITR.EXE
@START 140
DDT
FOOBAR/ new data
^Z
@
[End of TCO 6.1969]
TCO-number: 6.2011
Written-by: LEACHE Creation-date: 26-Mar-84 10:31:33
Edited-by: PURRETTA Edit-date: 25-Apr-84 15:08:53
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: MONITOR
Routines-affected: BOOT
Problem: -
Other systems cannot access a dual-ported RP04567 while BOOT is reading from
or writing to it.
Diagnosis: -
BOOT categorically seizes the port and the other system never has access to it.
Solution: -
Have BOOT release the port after each IO operation, and conditionally (based
on the drive's availability) re-seize the port immediately before the next
seek begins. A timeout value is used to prevent BOOT from endlessly attempting
to seize a stuck port.
[End of TCO 6.2011]
TCO-number: 6.2051
Written-by: LEACHE Creation-date: 29-Apr-84 17:25:06
Edited-by: LEACHE Edit-date: 2-May-84 08:51:09
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: MONITOR
Routines-affected: BOOT MTBOOT
Problem:
Depending on configuration, it can take an order of magnitude longer
for monitor startup to occur when the monitor has been loaded with
MTBOOT.
Diagnosis:
The channel initialization code for certain channels with RP20
DX20's repeatedly times out, significantly slowing up system
startup. When the system finally does come up, the RP20's in
question are not available until DX20LD is run for the parent DX20.
As it turns out, MTBOOT successfully loads and start all DX20's on
the system prior to beginning its search for a loaded mag tape unit.
Part of this search includes doing a MASSBUS reset for each channel
and (as a side affect of this) the DX20 micro-processor is halted.
MTBOOT takes this into account and restarts the DX20 when the units
on that channel are identified. Unfortunately, the restart code was
never updated to include the (then) new device type for RP20 DX20's.
Thus, if MTBOOT terminates its mag-tape search on channel N, all RP20
DX20's on channel N-1 and below will be halted when the system
comes up.
Solution:
Include RP20 DX20's in MTBOOT's DX20 restart logic.
[End of TCO 6.2051]
TCO-number: 6.2105
Written-by: LEACHE Creation-date: 22-Jun-84 17:20:40
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: Monitor
Routines-affected: BOOT MTBOOT
Problem: The monitor will soon have a PDVOP.
Diagnosis: The PDVOP will generate an EXE-directory entry that is unknown to
BOOT, causing BOOT to declare the EXE-file format to be bad.
Solution: Teach BOOT to ignore this entry.
[End of TCO 6.2105]
TCO-number: 6.2172
Written-by: LEACHE Creation-date: 13-Aug-84 16:37:19
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: MONITOR
Routines-affected: BOOT
Problem: On a 2-pass load, BOOT can sometimes fail to restore the IO
channels correctly.
Diagnosis: If the channel has suffered a register-access error prior
to entering the channel-restore code, the restore will fail, causing
PH2PIM or ILMNRF bughlts when the swappable monitor has been loaded.
Solution: Reset the channel before attempting to restore it.
[End of TCO 6.2172]
TCO-number: 6.2179
Written-by: LEACHE Creation-date: 17-Aug-84 15:32:18
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: Monitor
Routines-affected: BOOT
Problem:
BOOT cannot load long files.
Diagnosis:
No code to do so.
Solution:
Add the code.
[End of TCO 6.2179]
TCO-number: 6.2207
Written-by: LEACHE Creation-date: 29-Aug-84 16:48:37
Edit-checked: No Document: No TCO-tested: No
Maintenance-release: No Hardware-related: No
Program: Monitor
Routines-affected: BOOT
Problem: BOOT sometimes prints out error messages with null directory names.
Diagnosis: The output routine is fetching the byte pointer from the wrong
location.
Solution: Get it from the correct location.
[End of TCO 6.2207]