On Mon, 30 Aug 1999, Larry Augustin wrote:
> I seem to recall that on the SC450NX, the GPIO3 pin is used in
> conjunction with the addition of a Mylex AcceleRAID that takes over
> the on-board Symbios SCSI channels.
Thanks for the info, but I am sorry I missed your previous posting about
this topic.
In fact, the SYMBIOS Ultra-2 chips report the SCSI BUS mode in the STEST4
IO register, so the probing of GPIO3 gets useless, and, as a miracle, the
corresponding data manuals donnot speek anymore about the GPIO3 use for
DIFF controller probe.
I probably shouldn't have missed that, but SYMBIOS should have been clear
about that instead of letting drivers maintainers rely on some help from
Sherlock Holmes.
By the way, the 825/875 based differential controllers still must be
probed through GPIO3. Does the Mylex AcceleRAID also support the 875
chips and use GPIO3 for something else that DIFF flag ?
Will make appropriate changes in future driver versions for the SYMBIOS
Ultra-2 devices.
Regards,
G�rard.
> Leonard?
>
> Larry
>
> Gerard Roudier writes:
> >
> >
> > Hello Chuck,
> >
> > On Mon, 30 Aug 1999, Chuck Lever wrote:
> >
> > > hi gerard-
> > >
> > > ok, i built 2.2.5 with a minimal configuration, and it booted
> > > successfullly. after weeding through the configuration options, the
> > > problem option for me was SYMBIOS_COMPAT. when i disabled it, everything
> > > worked perfectly. i'm not sure why the sym53c8xx driver wasn't working
> > > earlier, but it seems to be now (2.2.12).
> >
> > This option is stated EXPERIMENTAL as you know and will never get
> > supported differently since it requires SYMBIOS compatible implementaion
> > of the LED support through GPIO0 and DIFFENTIAL SCSI detection on GPIO3
> > reading ZERO.
> > I cannot get sure it is safe since it probes the vendor specific part of
> > the chip called GPIO (General Purpose Input/Output) wiring that is board
> > implementation specific.
> > It may have been a misprobed DIFF that broke everything. The driver
> > prints out this feature if it will use it, but perhaps, the message text
> > scrolled to fast on your console.
> >
> > I probably should WARN more loudly about this option in the kernel
> > configuration help.
> >
> > > again, my hardware configuration is:
> > >
> > > S450NX mainboard with Intel 82450NX PCIset
> > > one ncr53c810a
> > > two ncr53c896's
> > > Symbios SCSI BIOS
> > > one SCSI back-plane with 6 SCA connectors
> > >
> > > thanks for steering me to the right conclusion.
> >
> > Btw, I have been confused by the bogus value (194) reported by the driver,
> > and, frankly, I donnot have, for now, a single bit of explanation about.
> >
> > Regards,
> > G�rard.
> >
> >
> > -
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>
>
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