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root@rk3308b-buildroot:/# [ 31.206136] vccio_sd: disabling
[ 35.924298] android_work: sent uevent USB_STATE=DISCONNECTED
[ 35.931272] dwc2 ff400000.usb: new device is high-speed
[ 35.968875] dwc2 ff400000.usb: new address 22
[ 35.983447] android_work: sent uevent USB_STATE=CONNECTED
[ 36.111456] android_work: sent uevent USB_STATE=DISCONNECTED
[ 36.118291] dwc2 ff400000.usb: new device is high-speed
[ 36.152733] dwc2 ff400000.usb: new address 23
[ 36.169174] android_work: sent uevent USB_STATE=CONNECTED
[ 36.303426] android_work: sent uevent USB_STATE=DISCONNECTED
[ 36.307297] dwc2 ff400000.usb: new device is high-speed
[ 36.355294] dwc2 ff400000.usb: new device is high-speed
[ 36.392134] dwc2 ff400000.usb: new address 23
[ 36.470426] android_work: did not send uevent (0 0 0000000000000000)
[ 36.474210] dwc2 ff400000.usb: new device is high-speed
[ 36.519178] dwc2 ff400000.usb: new device is high-speed
[ 36.556177] dwc2 ff400000.usb: new address 23
[ 36.708921] android_work: sent uevent USB_STATE=CONNECTED
[ 36.726724] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 000000002c70568d ep1in, 0)
[ 36.726809] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 0000000008b7f6bc ep2out, 0)
[ 36.727042] android_work: sent uevent USB_STATE=CONFIGURED
[ 39.476569] android_work: sent uevent USB_STATE=DISCONNECTED
[ 39.483065] dwc2 ff400000.usb: new device is high-speed
[ 39.516709] dwc2 ff400000.usb: new address 24
[ 39.530787] android_work: sent uevent USB_STATE=CONNECTED
[ 39.667342] android_work: sent uevent USB_STATE=DISCONNECTED
[ 39.670986] dwc2 ff400000.usb: new device is high-speed
[ 39.715946] dwc2 ff400000.usb: new device is high-speed
[ 39.752361] dwc2 ff400000.usb: new address 24
[ 39.830347] android_work: did not send uevent (0 0 0000000000000000)
[ 39.833959] dwc2 ff400000.usb: new device is high-speed
[ 39.879955] dwc2 ff400000.usb: new device is high-speed
[ 39.916104] dwc2 ff400000.usb: new address 24
[ 40.048631] android_work: sent uevent USB_STATE=CONNECTED
[ 40.067743] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 000000002c70568d ep1in, 0)
[ 40.067818] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 0000000008b7f6bc ep2out, 0)
[ 40.067928] android_work: sent uevent USB_STATE=CONFIGURED
[ 40.603839] android_work: sent uevent USB_STATE=DISCONNECTED
[ 40.610917] dwc2 ff400000.usb: new device is high-speed
[ 40.644778] dwc2 ff400000.usb: new address 25
[ 40.660464] android_work: sent uevent USB_STATE=CONNECTED
[ 40.790302] android_work: sent uevent USB_STATE=DISCONNECTED
[ 40.793932] dwc2 ff400000.usb: new device is high-speed
[ 40.839930] dwc2 ff400000.usb: new device is high-speed
[ 40.876425] dwc2 ff400000.usb: new address 25
[ 40.957266] android_work: did not send uevent (0 0 0000000000000000)
[ 40.960937] dwc2 ff400000.usb: new device is high-speed
[ 41.006954] dwc2 ff400000.usb: new device is high-speed
[ 41.040660] dwc2 ff400000.usb: new address 25
[ 41.292461] android_work: did not send uevent (0 0 0000000000000000)
[ 41.299852] dwc2 ff400000.usb: new device is high-speed
[ 41.337834] dwc2 ff400000.usb: new address 26
[ 41.353735] android_work: sent uevent USB_STATE=CONNECTED
[ 41.486569] android_work: sent uevent USB_STATE=DISCONNECTED
[ 41.489862] dwc2 ff400000.usb: new device is high-speed
[ 41.535873] dwc2 ff400000.usb: new device is high-speed
[ 41.572444] dwc2 ff400000.usb: new address 26
[ 41.689438] android_work: did not send uevent (0 0 0000000000000000)
[ 41.692862] dwc2 ff400000.usb: new device is high-speed
[ 41.739867] dwc2 ff400000.usb: new device is high-speed
[ 41.776677] dwc2 ff400000.usb: new address 26
[ 41.890853] android_work: sent uevent USB_STATE=CONNECTED
[ 41.909219] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 000000002c70568d ep1in, 0)
[ 41.909325] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 0000000008b7f6bc ep2out, 0)
[ 41.909479] android_work: sent uevent USB_STATE=CONFIGURED
[ 42.045035] android_work: sent uevent USB_STATE=DISCONNECTED
[ 42.051764] dwc2 ff400000.usb: new device is high-speed
[ 42.090570] dwc2 ff400000.usb: new address 27
[ 42.106308] android_work: sent uevent USB_STATE=CONNECTED
[ 42.236437] android_work: sent uevent USB_STATE=DISCONNECTED
[ 42.239775] dwc2 ff400000.usb: new device is high-speed
[ 42.287831] dwc2 ff400000.usb: new device is high-speed
[ 42.324538] dwc2 ff400000.usb: new address 27
[ 42.401729] android_work: did not send uevent (0 0 0000000000000000)
[ 42.405810] dwc2 ff400000.usb: new device is high-speed
[ 42.451831] dwc2 ff400000.usb: new device is high-speed
[ 42.488615] dwc2 ff400000.usb: new address 27
[ 42.640821] android_work: sent uevent USB_STATE=CONNECTED
[ 42.660848] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 000000002c70568d ep1in, 0)
[ 42.661023] android_work: sent uevent USB_STATE=CONFIGURED
[ 42.661034] dwc2 ff400000.usb: dwc2_hsotg_ep_sethalt(ep 0000000008b7f6bc ep2out, 0)
[ 43.592067] usb 2-1: new high-speed USB device number 2 using ehci-platform
[ 44.256145] usb 2-1: USB disconnect, device number 2
[ 49.920090] usb 2-1: new high-speed USB device number 3 using ehci-platform
[ 50.053051] cdc_ether 2-1:1.0 usb0: register 'cdc_ether' at usb-ff440000.usb-1, CDC Ethernet Device, 02:0c:29:a3:9b:6d
root@rk3308b-buildroot:/#
root@rk3308b-buildroot:/#
root@rk3308b-buildroot:/# ls /dev/ttyUSB*
ls: cannot access '/dev/ttyUSB*': No such file or directory
root@rk3308b-buildroot:/# lsusb
Bus 003 Device 001: ID 1d6b:0001
Bus 002 Device 003: ID 2c7c:6005
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0002
root@rk3308b-buildroot:/#
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