Re: L68K: Re: Afterburner and Linux

From: Frank Naumann <fnaumann_at_prinz-atm.cs.Uni-Magdeburg.DE>
Date: Mon, 8 Jun 1998 11:55:03 +0200 (MESZ)

Hi Doug!

Thank you for your response :-)

> >Yes, I agree. I chatted with Uwe Seimet and he mean something like that
> >(I don't know exactly). This is also the problem why logging SCSI-drives
> >at bootup only works with data cache off.
> It seems that whatever HDDriver is doing during SCSI logging, the problem
> is simply due to the CPU cacheing stale data.
> That means it's either hardware registers being cached - which should not
> be possible so long as they lie in the usual address space for hardware

Can this configured by TK?

> (the top 1mb or so of the address space), or HDDriver is using DMA to get
> information from the SCSI device, and the DMA operation is taking place
> in some area of cacheable ST-ram. I think the latter is likely. In which
> case,
> HDDriver should deal with it by making sure the caches are off during the
> logging process.

Yes, but I have problems with XHDI if caches are on. XHDI doesn't work
correctly (some operations, XHDosLimits for example) if the data cache is



doesn't help. If data cache is on (after boot) and I use XHDosLimits
something goes *very* wrong.


Mausnet:  Frank Naumann _at_ L2                 
Received on ma. juni 08 1998 - 18:34:00 CEST

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