Messages in this thread | | | Subject | Re: ioport conflict with "dma page reg" (0x80) | Date | Tue, 16 Mar 1999 09:10:49 +0100 (MET) | From | (Rogier Wolff) |
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Richard B. Johnson wrote: > On Mon, 15 Mar 1999, Wall, Tim wrote: > > > I have a single-board computer with a hardware watchdog which uses I/O > > addresses 0x80, 0x443, and 0x444. > > > > The problem is that something else in the system is writing to 0x80, > > which resets/disables the watchdog. > > > > 0x80 is the manufacturing test port. If you have a watchdog that > cares about that, it's broken. The kernel didn't reserve it, the > AT-Class hardware did. In fact during POST, you can read numbers > written to that port to see how far a, possibly defective, board > has gotten upon power up.
But, using port 0x80 to keep the watchdog from activating is a good way of making sure that the system comes through the POST before the watchdog kicks in....
Read Alans reply for the hint on how to get along.
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* * Never blow in a cat's ear because if you do, usually after three or * * four times, they will bite your lips! And they don't let go for at * * least a minute. -- Lisa Coburn, age 9
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