Hi,
I apologize if this is slightly OT, but I am in need of help from some
USB gurus. I am trying to analyse a problem with (my) Garmin nuvi GPS
units attached to an Ubuntu 12.04 system running Windows (both XP and
Windows 8 exhibit the same problem) inside VirtualBox.
The unit should eventually appear to the windows os as two portable
storage devices (usb mass storage). However the connection process is
aborted early on in windows with a "device cannot start code 10"
diagnostic (whatever that means!).
I have run a wireshark trace of the of the usb activity on the device in
the linux os (available here http://paste.ubuntu.com/5637367/), a USB
trace inside the windows guest os (available here
http://paste.ubuntu.com/5637375/), and a trace of a good connection on a
native windows machine running vista (available here
http://paste.ubuntu.com/5637385/).
The trace logs of the bad connection in the windows guest os and the
good connection in the windows native os are essentially identical until
packet 40 which is a response to a "Read Format Capacities 0x23" command
sent in packet 37. This ties in to packet number 107 in linux wireshark
log, although I should point out this log is not from the same test run
as the one for the windows guest os.
The windows guest os log show and the linux log show that the nuvi
device replies with a packet which contains just the 12 byte header of
the response. This appears to throw the windows guest os into confusion
from which it never recovers.
However the native os trace shows this packet as containing a zero
length response after which the native os seems to retry a few and
eventually recover and proceed with setting up the devices.
My background is now mainly linux. But I am not familiar with the USB
mass storage protocols. Can anyone explain what is going on here. It
looks to as if in the native situation the windows USB code is applying
some kind of kludge to get round the response from the nuvi, but this
kludge is not being applied in the hosted environment.
Any help on understanding this will be gratefully received.
Roger
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
