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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Boot_WB on February 23, 2005, 06:12:26 PM

Title: aibb tells me MMU status - OFF
Post by: Boot_WB on February 23, 2005, 06:12:26 PM

Hello,

Wondering if anyone has had &/ resolved this problem.

HW: A1200, 3.1 roms, Blizzard 1240 (DCE ver) @33MHz , 128mb Ram (1 simm).
SW: OS3.9 fresh install.  
Wordworth7.0/multiplot/mathscript/turboprint/MUI/magicWB/idefix97 also installed.

When I run AIBB or Sysinfo the MMU status is OFF.  

I've tried installing 68040.library from aminet/biz/p5
Following the readme instructions I renamed:
68040dummy.library to 68040.library
68040.library to 68040new.library.  
As I didn't have an existing 68040.library I didn't rename it 68040old.library - as it didn't exist.
I got multiple recoverable alerts 0100 000F (task 7800ca58) on bootup which froze and crashed eventually.  I understand this is something to do with exec, but don't know any further.

Have also tried installing mmulib from aminet - same problem, repeated 0100 000f errors - can't remember if it was the same task.
(ended up knackering my partitions aswell in all the reboots, had to reinstall from scratch :¬( )

Is it a knackered MMU? A not-quite-properly working blizzard? Is it something missing form the software environment?

Any suggestions most appreciated - I've tries everything I can think of for now.

Regards



Rich

Title: Re: aibb tells me MMU status - OFF
Post by: bloodline on February 23, 2005, 06:35:15 PM

Well, what are you using the MMU for?

Title: Re: aibb tells me MMU status - OFF
Post by: Piru on February 23, 2005, 06:40:21 PM

Quote

When I run AIBB or Sysinfo the MMU status is OFF.

Don't trust AIBB or SysInfo for 68040 or 68060 CPU info.

On properly set up 68040/68060 system MMU is always enabled.

Quote

I got multiple recoverable alerts 0100 000F (task 7800ca58) on bootup which froze and crashed eventually.

This means something is calling FreeMem with bogus pointer (AN_BadFreeAddr). Try booting with clean system (clean AmigaOS install + correct 68040 libs). If that works your current AmigaOS install is messed up somehow (possibly by some library or app that gets loaded at startup).

If you get crashes even with clean AmigaOS system, then it might be hw related problem. If so, I'd suggest starting by checking for bad SIMM(s).

Title: Re: aibb tells me MMU status - OFF
Post by: Boot_WB on February 23, 2005, 08:06:12 PM

>If you get crashes even with clean AmigaOS system, then it >might be hw related problem. If so, I'd suggest starting >by checking for bad SIMM(s).

Good call!

Changed the SIMM, put the libraries back in: no more recoverable errors, and AIBB now says MMU on.
Should've thought of that myself, really, as had a similar PC (yuk!) problem a while back.

Many thanks


Rich