On 17 March 2015 at 19:51, Tyler Baker tyler.baker@linaro.org wrote:

Hi,

I have been trying to flash Peter's u-boot port to my early access hikey board without success. I'm stuck trying to use the burn-boot tool as the usb-serial device used in download mode keeps disconnecting.

[ 165.408788] option 3-3:1.0: device disconnected [ 251.495189] usb 3-3: new full-speed USB device number 6 using xhci_hcd [ 251.624288] usb 3-3: New USB device found, idVendor=12d1, idProduct=3609 [ 251.624292] usb 3-3: New USB device strings: Mfr=1, Product=4, SerialNumber=0 [ 251.624293] usb 3-3: Product: \xffffffe3\xffffff84\xffffffb0㌲㔴㜶㤸 [ 251.624295] usb 3-3: Manufacturer: 䕇䕎䥎 [ 251.624780] option 3-3:1.0: GSM modem (1-port) converter detected [ 251.624862] usb 3-3: GSM modem (1-port) converter now attached to ttyUSB0 [ 252.131320] usb 3-3: USB disconnect, device number 6 [ 252.131539] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0 [ 252.131560] option 3-3:1.0: device disconnected

What I have tried and has not worked.

• Using various PC's, System76 laptop w/Ubuntu 14.10, Chromebook

Pixel 2 w/Debian 8, and Dell XPS8700 w/Debian 8 headless. All these system show the kernel messages above.

• Disabling network manager
• sudo echo 12D1 3609 > /sys/bus/usb-serial/drivers/option1/new_id;

sudo mknod /dev/ttyUSB0 c 188 0 as suggested by the wiki

• Using other micro-usb cables.
• Created a script to loop the burn-boot tool

Any thing else to try?

Not sure what to try, over here it stays available for 20s or so, not the 0.5s your log shows :(