Re: PowerPC SCSI driver

[F. H. <fh...@at...>]

On Sun, Sep 17, 2000 at 08:01:03PM +0200, Geert Uytterhoeven wrote:
> On Sun, 17 Sep 2000, Michel [iso-8859-1] Dänzer wrote:
> > "F. Heitkamp" schrieb:
> > > CACHE TEST FAILED: host wrote 5, ncr read 0.
> > > CACHE TEST FAILED: ncr wrote 7, host read 5.
> > > CACHE INCORRECTLY CONFIGURED.
> > 
> > This looks like the CPU only writes to and reads from cache. Maybe you should
> > map the memory as uncacheable?
> 
> Or you wrote to a different place than the NCR expects, so the result in
> memory wasn't modified.

It is beyond me how the structure is aligned in memory.
I wish I could draw a nice picture of where things should
be but I don't know enough about the memory layout of 
the Amiga or Linux.

Yes.  It apears that the scratcha register which had a 
non zero value in it, had a zero written to it, however
the value the was in the ncr_cache variable was unchanged.
So the script did not access the proper location.  Here is
the script section:

3679 }/*-------------------------< SNOOPTEST >-------------------*/,{
   3680     /*
   3681     **  Read the variable.
   3682     */
   3683     SCR_COPY (4),
   3684         NADDR(ncr_cache),
   3685         RADDR (scratcha),
   3686     /*
   3687     **  Write the variable.
   3688     */
   3689     SCR_COPY (4),
   3690         RADDR (temp),
   3691         NADDR(ncr_cache),
   3692     /*
   3693     **  Read back the variable.
   3694     */
   3695     SCR_COPY (4),
   3696         NADDR(ncr_cache),
   3697         RADDR (temp),
   3698 }/*-------------------------< SNOOPEND >-------------------*/,{

> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geertOlinux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
> 

-- 
Fred