On Sat, 8 Sep 2007, Peter Rasmussen wrote:
> > In fact there was another patch from earlier in the email thread, which
> > was needed to work around the PQ = 1 problem. Since you didn't apply
> > that patch, the SCSI disk driver wasn't bound to your Z6.
> >
> >
> Now I applied that patch, too, and it did make a difference, in
> drivers/scsi/scsi_sysfs.c I have:
>
> static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
> {
> struct scsi_device *sdp = to_scsi_device(dev);
> if (sdp->no_uld_attach)
> return 0;
> return 1;
> // return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
> }
Did you also make the change to usb-storage for ignoring wrong Tag
values?
> Before posting a lot of USB debug output, I'll explain a shorter version :-)
>
> 1.After reboot I connected the Z6 (incl. a micro-SD card) and got
> what looked good, if not the usual output from dmesg:
>
> <snip>
> scsi 0:0:0:0: Direct-Access Motorola MSnc. PQ: 1 ANSI: 0
> CCS
> <snip>
> sd 0:0:0:0: [sda] Attached SCSI removable disk
> sd 0:0:0:0: Attached scsi generic sg0 type 0
> <snip>
> scsi 0:0:0:1: Direct-Access Motorola MSnc. PQ: 1 ANSI: 0
> CCS
> <snip>
> sd 0:0:0:1: [sdb] Attached SCSI removable disk
> sd 0:0:0:1: Attached scsi generic sg1 type 0
> <snip>
Evidently the phone didn't report that the micro-SD card was present.
Otherwise you would have seen log entries describing the number of
sectors and the write-protect status.
> 2.I could then mount the SCSI devices like this:
>
> # mount /dev/sda /mnt/usb
> # mount /dev/sdb /mnt/usb2
>
> When I normally with a USB mass storage device do, eg.:
>
> # mount /dev/sda1 /mnt/usb
>
> 3.I couldn't however, always mount the mentioned devices as I would
> sometimes get a 'mount: No medium found' error, and a message on the
> mobile will sometimes show "USB connected" and sometimes "USB
> disconnected" even though it didn't seem to correlate to successful
> connection between my PC and the Z6.
>
> 4.So, something seems to be inconsistent. I have tried it with a few
> different cables and I can't detect a difference.
>
> 5.Should I post a full log of eg. connecting the Z6, mounting it and the SD
> card, accessing it and then unmounting?
> A full log may then include failed attempts, which will perhaps give some
> hints at what is wrong?
> Or do you already have a pretty good idea as to what is wrong, and find
> that such an exercise is not really useful?
If you want to post a log, include only the initial connection and one
failed mount attempt. Also, you can remove linux-scsi from the CC:
list above, since this bug no longer involves any SCSI-level issues.
> > :-) There's no necessary relation between the OS running on a device
> > like your phone and its interoperability with computers running the
> > same OS.
> >
> >
> Well, I would have expected that they have similar methods to
> connect, even though different Linux kernel version of course may
> have introduced some differences. My A780 has a 2.4.20 kernel and I
> wouldn't be surprised if other Motorola mobiles also use the 2.4.*
> series of Linux kernels.
Not at all -- the methods used for connecting are _completely_
different, because the phone connects as a peripheral whereas the
kernel expects to connect as a host.
> >> And you say that this seems to be a more widespread problem with
> >> Motorola devices? Do you remember which ones, and do they run Linux as
> >> well?
> >>
> >
> > There were two problems. First was the PQ = 1 problem; I have never
> > seen it before now (so only on the Z6). The other problem was the
> > capacity, or last sector number; we know that the RAZR V3i and V3x both
> > suffer from it as well. (I have no idea whether they run Linux.)
> > Possibly other devices do too, and we just don't know about them.
Plus the third (incorrect Tags) problem, which I forgot to mention
earlier.
> I know that those two don't run Linux, but can they connect to a
> Linux host, or do they also have problems?
They can connect to a Linux host with no problem, now that the
appropriate quirks entries have been created.
Alan Stern
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