| Line 1... |
Line 1... |
# $ $Id: w11a_known_issues.txt 316 2010-07-16 19:07:47Z mueller $
|
# $Id: w11a_known_issues.txt 317 2010-07-22 19:36:56Z mueller $
|
|
|
|
Summary of known issues for w11a CPU and systems
|
|
|
|
Table of content:
|
1. Known differences between w11a and KB-11C (11/70)
|
1. Known differences between w11a and KB-11C (11/70)
|
|
2. Known limitations
|
|
3. Known bugs
|
|
|
|
|
|
1. Known differences between w11a and KB-11C (11/70) ----------------------
|
|
|
- the SPL instruction in the 11/70 always fetched the next instruction
|
- the SPL instruction in the 11/70 always fetched the next instruction
|
regardless of pending device or even console interrupts. This is known
|
regardless of pending device or even console interrupts. This is known
|
as the 'spl bug', see
|
as the 'spl bug', see
|
http://minnie.tuhs.org/pipermail/pups/2006-September/001082.html
|
http://minnie.tuhs.org/pipermail/pups/2006-September/001082.html
|
| Line 28... |
Line 36... |
|
|
All four points relate to very 11/70 specific behaviour, not operating system
|
All four points relate to very 11/70 specific behaviour, not operating system
|
depends on them, therefore they are considered acceptable implementation
|
depends on them, therefore they are considered acceptable implementation
|
differences
|
differences
|
|
|
2. Known limitations
|
2. Known limitations ------------------------------------------------------
|
|
|
- some programs use timing loops based on the execution speed of the
|
- some programs use timing loops based on the execution speed of the
|
original processors. This can lead to spurious timeouts, especially
|
original processors. This can lead to spurious timeouts, especially
|
in old test programs.
|
in old test programs.
|
--> a 'CPU throttle mechanism' will be added in a future version to
|
--> a 'CPU throttle mechanism' will be added in a future version to
|
| Line 42... |
Line 50... |
especially when the server runs as normal user process. This can lead
|
especially when the server runs as normal user process. This can lead
|
to timeout, again mostly in test programs.
|
to timeout, again mostly in test programs.
|
--> a 'watch dog' mechanism will be added in a future version which
|
--> a 'watch dog' mechanism will be added in a future version which
|
suspends the CPU when the server doesn't respond fast enough.
|
suspends the CPU when the server doesn't respond fast enough.
|
|
|
3. Known bugs
|
3. Known bugs -------------------------------------------------------------
|
|
|
- TCK-036 pri=L: RK11: hardware poll not working
|
- TCK-036 pri=L: RK11: hardware poll not working
|
The RK11/RK05 hardware poll logic is probably no reflecting the
|
The RK11/RK05 hardware poll logic is probably no reflecting the
|
behaviour of the real drive.
|
behaviour of the real drive.
|
|
|
