Trying a Promise Ultra/66 on powerpc

Andre M. Hedrick hedrick at Astro.Dyer.Vanderbilt.Edu
Wed Jul 28 17:17:39 EST 1999

On Wed, 28 Jul 1999, Michel Lanners wrote:

> > On a much less related note:
> > drow:~# hdparm -p /dev/hdc
> > 
> > /dev/hdc:
> >  attempting to auto-tune PIO mode
> >  HDIO_SET_PIO_MODE failed: Function not implemented
> > 
> > pdc202xx.c has no tuneproc.  Is this deliberate?

YES, there are no known or possible way to ever get the card in to a PIO
mode that is meaningful.  The BIOS defaults to a fixed value.

> > 
> > As it is I get this (off a 5400 RPM Maxtor 25.4G DiamondMax)
> > /dev/hdc:
> >   Timing buffered disk reads:  32 MB in  5.83 seconds = 5.49 MB/sec
> This is not brilliant, but acceptable. What mode of operation was that
> in? UDMA? Or regular DMA or even PIO?

I am glad that it meets with your approval, if you can do better do it!
The drive is in a DMA mode 2, based on the xfer rate.

> On a related note, can you provide the patches you needed to apply
> (minus the uniform IDE stuff from Andre, which I have)? I'm planning to
> get my Ultra66 on Friday ;-)...

You will need more as I have just found a quirk in the chipset.
I know on no real way to test the adpater for the correct ribbon, yet.
It also does a fake and allows a drive to invoke the UDMA4 flag from the
drive with the wrong cable.

> Michel
> -------------------------------------------------------------------------
> Michel Lanners                 |  " Read Philosophy.  Study Art.
> 23, Rue Paul Henkes            |    Ask Questions.  Make Mistakes.
> L-1710 Luxembourg              |
> email   mlan at            |
>        |                     Learn Always. "

Andre Hedrick
The Linux IDE guy

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