On Monday 15 January 2007 16:36, Alan Stern wrote:
> Here's another approach to try. Get hold of the "usbreset" program, which
> I posted here:
>
> http://marc.theaimsgroup.com/?l=linux-usb-users&m=116827193506484&w=2
>
> After plugging in your device, when the usual probing fails, do this:
> First, run usbreset on it. Then issue these commands:
Doesn't really work:
# ./usbreset /proc/bus/usb/001/002
Resetting USB device /proc/bus/usb/001/002
Reset successful
# ./plscsi -x '12 0 0 0 24 0' -i 36 /dev/sg0
// sgioOpen.open: No such file or directory
// plscsi.sclOpenNext: "/dev/sg0" not opened
// -x0001 = -1 = plscsi.main exit int
# ./plscsi -x '12 0 0 0 24 0' -i 36 /dev/sg1
// sgioOpen.open: No such file or directory
// plscsi.sclOpenNext: "/dev/sg1" not opened
// -x0001 = -1 = plscsi.main exit int
# blockdev --rereadpt /dev/sda
# mount -t vfat /dev/sda1 /mnt/stick
mount: block device /dev/sda1 is write-protected, mounting read-only
The longer sequences fail in the same way. Apparently I'm missing something -
could I be resetting the wrong device? The (hopefully) relevant section
of /proc/bus/usb/devices is
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=13fe ProdID=1a21 Rev= 1.00
S: Manufacturer=
S: Product=Nu Drive
S: SerialNumber=075A141402A5
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=200mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> Unfortunately I can't think of any way to make this happen transparently
> in the kernel. The stumbling block is that Linux tries to set up each
> LUN as it is probed, whereas Windows probes all the LUNs first before
> setting up any of them -- and the device definitely wants things done the
> Windows way.
Well, I could live with the commands in a script - I have to mount the device,
so I've got to run something anyway before accessing it - the problem is I
can't write into it...
Bye
Vasek
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