On 10/13/13 10:22, Alexey Dokuchaev wrote:
On Sun, Oct 13, 2013 at 08:50:53AM +0200, Hans Petter Selasky wrote:
iPhones sometimes have multiple configurations.
usbconfig -d X.Y dump_device_desc
Dumping desc produced almost identical files (the only differences were in
idProduct and iSerialNumber, quite expectedly).
usbconfig -d X.Y set_config 1
usbconfig -d X.Y set_config 2
usbconfig -d X.Y set_config 3
I presume I do not need to re-plug or otherwise re-init the phone after
setting config, correct? (It seems I don't, asking just to make sure.)
No need to re-plug.
PTP might not always be available from the first configuration.
I've tried to play with set_config, but without much luck. However, I did
dump_all_config_desc to discover that config index 2 (the one that is "PTP
+ Apple Mobile Device", with bInterfaceClass = 0x0006) is missing from the
output for the "bad" iPhone (diff attached).
Why is it missing? Is there any way to force/inject it into the stack?
You cannot force it.
You might want to watch "usbdump -i usbusX -f Y -vvv -s 65536"
while running the config descriptor dump for the broken device. Look for
Might also be a corrupt USB descriptor, which the USB stack will reject.
Would be interesting to know what the cause of this issue is. Are any of
these iPhones JailBroken?
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