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- Short: Workaround for CSPPC/233 hardware bug
- Author: lesueur@club-internet.fr, frank@phoenix.owl.de (Frank Wille & Emmanuel Lesueur)
- Uploader: frank@phoenix.owl.de
- Type: hard/misc
- Requires: powerpc.library or ppc.library
-
- Some CyberStormPPC 604e/233MHz boards seem to suffer from annoying
- random crashes under WarpOS as well as under PowerUp. They might be
- caused by some kind of hardware bug, which sets bit 0 or bit 2 of the
- PowerPC's LR register in certain situations. This will result into an
- instruction access fault, when a program returns from a sub routine.
-
- If you ever got an instruction access exception where the first digit
- of LR is not '0', then this program might solve most of your troubles.
-
- Whether this problem comes from a defective board, or a bad power supply,
- or from too much heat is unknown. But surprisingly it only affects
- CSPPCs with a 233 MHz CPU. 200 MHz is fine, I have one for comparison!
-
- This archive contains two exception handlers, one for PowerUp
- (CSPPC233Fix_ppc) and one for WarpOS (CSPPC233Fix_wos), which reset
- those trashed bits in case of an exception which is recognized as the
- "LR-Bug problem". The PPC program is able to continue after LR was fixed.
-
-
- USAGE:
-
- CSPPC233Fix_ppc (PowerUp version):
- ----------------------------------
- Can be started from CLI and from Workbench.
- CLI Usage:
- LRBug NOREQ/S,QUIET/S,NOWAIT/S
-
- NOREQ: don't ask before attempting to restart a task.
- QUIET: don't write messages with kprinf() when restarting a task.
- NOWAIT: don't install a handler, just restart crashed tasks and quit.
-
- WB Usage:
- Tooltypes NOREQ, QUIET, and NOWAIT, with the same meaning.
-
- To remove the handler, send a CTRL-C.
-
- CSPPC233Fix_wos (WarpOS version):
- ---------------------------------
- Just start from CLI. No options. To remove the handler, press CTRL-C.
- Whenever an LR-Bug occurs, the hit will be printed to stdout. If
- you don't want that, redirect output to NIL:. All other exceptions
- will be invoke the WarpOS exception window, as usual.
-
-
- REBUILD:
-
- The full source text of both programs is included and a makefile is
- provided to rebuild them with vbcc. The PowerUp version can also be
- compiled with SAS/C and gcc. The WarpOS version with StormC (gcc-WarpOS
- is not recommended for an exception handler, because of different ABIs).
-