Hi George, Here's the full log and it seems usbserial support is getting registered.

[33949.970976] usb 1-1.1: new full-speed USB device number 6 using ehci-pci

[33950.064568] usb 1-1.1: New USB device found, idVendor=12d1, idProduct=3609

[33950.064583] usb 1-1.1: New USB device strings: Mfr=1, Product=4, SerialNumber=0

[33950.064592] usb 1-1.1: Product: \xffffffe3\xffffff84\xffffffb0\xffffff84\xffffffb0\xffffffe3\xffffff8c\xffffffb2\xffffff8c\xffffffb2\xffffffe3\xffffff94\xffffffb4\xffffff94\xffffffb4\xffffffe3\xffffff9c\xffffffb6\xffffff9c\xffffffb6\xffffffe3\xffffffa4\xffffffb8\xffffffa4\xffffffb8

[33950.064599] usb 1-1.1: Manufacturer: \xffffffe4\xffffff95\xffffff87\xffffff95\xffffff87\xffffffe4\xffffff95\xffffff8e\xffffff95\xffffff8e\xffffffe4\xffffffa5\xffffff8e\xffffffa5\xffffff8e

[33950.129406] usbcore: registered new interface driver usbserial

[33950.129429] usbcore: registered new interface driver usbserial_generic

[33950.129447] usbserial: USB Serial support registered for generic

[33950.144501] usbcore: registered new interface driver option

[33950.144551] usbserial: USB Serial support registered for GSM modem (1-port)

[33950.144690] option 1-1.1:1.0: GSM modem (1-port) converter detected

[33950.144787] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0

[33950.541308] usb 1-1.1: USB disconnect, device number 6

[33950.541773] option1 ttyUSB0: usb_wwan_indat_callback: resubmit read urb failed. (-19)

[33950.541783] option1 ttyUSB0: usb_wwan_indat_callback: resubmit read urb failed. (-19)

[33950.541789] option1 ttyUSB0: usb_wwan_indat_callback: resubmit read urb failed. (-19)

[33950.541795] option1 ttyUSB0: usb_wwan_indat_callback: resubmit read urb failed. (-19)

[33950.542051] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0

[33950.542091] option 1-1.1:1.0: device disconnected

amit@linaro:~$

On 7 September 2015 at 13:54, George Grey <george.grey@linaro.org> wrote:

One other possibility - I don’t see the usbserial support being registered in Amit’s log.
Could it be that you have got the relevant usbserial detection support enabled on your Linux box ….
George

> On Sep 7, 2015, at 9:20 AM, Daniel Thompson <daniel.thompson@linaro.org> wrote:
>
> On 06/09/15 04:05, Guodong Xu wrote:
>> Amit,
>>
>> The 90 seconds delay is key here. In "install bootloader" mode, you must
>> make sure to start the USB download process within 90 seconds of
>> powering up hikey.
>>
>> The log you attached makes sense to me. Everything are reasonable. Here
>> for your reference, is on mine board and PC. In this case, I should run
>> 'hisi-idt.py' before [14495.204951].
>
> On Amit's board the logs do look very similar but the disconnect happens after half a second (rather than 90 seconds). I think that is what leads to a guess conclusion there is a hardware fault.
>
>
> Daniel.
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Regards,

Amit Khare