On Thu, 27 Jul 2000, Gérard Roudier wrote:
> >
> > The problem is with the DVD drive and CD writer. When I query the SCSI utility
> > at boot about these two drives' capabilitites, it says that none of them
> > support wide negociation or TCQ. By default, though, these settings were
> > enabled on both. The DVD drive worked, but not the CD writer.
>
> In theory at least, the [sym|ncr]53c8xx drivers donnot initiate Wide
> negotiations neither use tags with a device if they haven't seen these
> features reported by the device in the INQUIRY response. The fact that one
> device works and the other fails seems strange too.
>
Does this mean that it does not try and disable wide negociation for a drive
and assume that it is off by default (same for TCQ)?
> > I then disabled these two settings by hand, and my CD writer worked... My
> > questions are the following:
>
> Mine could be::-)
>
> 1. Why did you disable the both settings at the same time instead of one
> at a time ?
I wanted to have it work ;) Config is not here but @home, I'll try and disable
one at a time this WE and report - if you're interested. Also, I haven't tried
direct CD to CD copy with wide neg on for the DVD...
> 2. What 'hand' did you use to disable the feature ? (could be either the
> NVRAM setup, the boot command line, ...)
>
I used the SCSI card utility setup, so I guess that's the NVRAM setup?
> Btw, I would prefer to be told about the INQUIRY data the devices actually
> return. You may use the 'scsiinfo' tool for that.
>
I'll do.
> > 1. how come the SCSI card didn't disable these options automatically, even
> > though it knew about the drive capabilities?
>
> The card has NVRAM (NV=non volatile) that stores the user setup. There is
> no valuable reasons for the Tekram setup program to prevent user from
> entering any setup it wishes, in my opinion.
>
Fair enough... Bad User, Change User :)
>
> For now, you may try to enable some debug traces in the driver, starting
> with the following (boot command line):
>
> sym53c8xx=debug:0x200,verb:2
>
> The debug flag will tells the driver to print out all negotiation messages
> and resulting parameter's value.
>
OK, will do. Full report by Monday. Thank you for your help.
-- Francis Galiegue, fg@mandrakesoft.com "Programming is a race between programmers, who try and make more and more idiot-proof software, and universe, which produces more and more remarkable idiots. Until now, universe leads the race" -- R. Cook- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Jul 31 2000 - 21:00:26 EST