Re: esp_scsi QTAG in FAS216

Kars de Jong
2014-04-10T15:01:45Z

2014-04-06 22:33 GMT+02:00 Michael Schmitz <schmitzmic@gmail.com>:
>
> Hello Dave, Tuomas,
>
> >> Also, looking at the timeout formulae in the old NCR53C9x.c driver,
> >> the values would be different for FAS216. Why was this dropped from
> >> the modern esp_scsi?
> >
> > I've never seen a formula for any ESP or FAS chip for the timeout
> > other than the one mentioned in huge comment in
> > esp_set_clock_params(), although I do see the 7668 instead of 8192
> > factor being used in the old NCR53C9x driver.
>
> I haven't gone far enough back in the 53C9x revision history to be
> certain. but it would seem to me that Kars de Jong added that FAS
> special case.
>
> Can you confirm that, Kars? Any recollection as to the reason?

That is the value that's in the data manual of the Symbios Logic
SYM53CF94/96-2 (the actual chip that's in my Amiga SCSI controller).

Funny, according to the QLogic FAS2x6 manual the value should be 7682
for FAS216/216U/236/236U chips...

I don't think it's all that important. It only means that the actual
selection timeout used by the chip will be slightly shorter than it is
supposed to be.

Kind regards,

Kars.