Re: A3000T: Kernel 2.4.0-test9 working?

[<gri...@ps...>]

> When I disable PCI support, I cannot use CVPPC and therefore open the console
> on my CV64/3D. There I get the following lines:
> 
> 	Non-serviced A3000 SCSI-Interrupt? ISTR xxxx

Whooo.. That's an *old* problem. Write-reordering to the WD33C93 chip.

Check out drivers/scsi/a3000.c. Are there any [rw]mb() calls in there? 

If not then the original fix for APUS is missing..

Add these lines (sorry, no line numbers.. Just quick cut'n'paste):

     /* start DMA */
+    mb();                      /* make sure setup is completed */
     DMA(a3000_host)->ST_DMA = 1;
+    mb();                      /* make sure DMA has started before next IO */
 

And:

 
     DMA(instance)->CNTR = cntr;
+    mb();                      /* make sure CNTR is updated before next IO */
 
     /* flush if we were reading */
     if (HDATA(instance)->dma_dir) {
        DMA(instance)->FLUSH = 1;
+       mb();                   /* don't allow prefetch */
        while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
-           ;
+           barrier();
+       mb();                   /* no IO until FLUSH is done */
     }

Also:

     /* stop DMA */
     DMA(instance)->SP_DMA = 1;
+    mb();                      /* make sure DMA is stopped before next IO */
 
     /* restore the CONTROL bits (minus the direction flag) */
     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
+    mb();                      /* make sure CNTR is updated before next IO */
 
     /* copy from a bounce buffer, if necessary */

That should fix it..


								Bye, Arno.

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