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AMD 5x86 cache problem

Posted on 1997-01-20
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Last Modified: 2013-12-14
I'm running a dual boot Win95/NT4 system with a 5x86 chip on a generic 486 motherboard. When run at 120MHz it runs fine, but clocked at 133 or 160 the board switches the L1 cache off.  I can switch it back on in DOS but is there a way to turn it back on for NT? BTW, NT boots even at 160MHz.
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Question by:psw01
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jeval earned 400 total points
ID: 1764498
I don't understand why your board is switching L1 cache off.  Even more puzzeling to me is why you want to turn L1 cache back on if the board saw fit to turn it off?  If you think that the board is in error when it turns L1 cache off, then I recommend that you go back to the manufacturer and request an updated rom bios.  If the board is behaving as designed, I would recommend that you not try to defeat it.

If you really want to do in NT what you say you can do in DOS then here is a procedure that you can try:  In regedt32 go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager and add the command line invocation of your dos program to the BootExecute value (make sure that your program is in the system path).  This will cause your dos program to execute at boot time before NT is brought up.  Make sure you take a backup of  your registry beforehand.  If your dos program prevents NT from coming up correctly you will need to restore the registry in order to get a working system back.  Alternatively, you could create an additional control set containing the above BootExec modification and then use NT's alternative control set selection facility at boot time to go back to the "last known working control set" if necessary.
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