Hi, Kai Ruhnau <kai.ruhnau@xxxxxxxxxxxxx> writes: > On my i.MX6 SoloX, I have configured one of the OTG ports for a > combined RNDIS/ECM gadget. After boot, I have two network interfaces > (usb0 and usb1) which are managed by systemd-networkd. > > With kernel 4.9.153, systemd-networkd reports an immediate carrier > loss when I pull the USB cable from a Windows or macOS host. With > 4.19.53 or 5.1.15 that carrier loss is only reported when I re-attach > the cable, meaning there is a "Lost carrier" for the last used > interface immediately followed by a "Gained carrier" for the newly > connected interface. First of all, thanks for actually testing the most recent stable kernels. Much appreciated :-) > I have activated CONFIG_USB_GADGET_DEBUG_FILES, and the contents of > /proc/driver/rndis-000 don't change when I pull the cable: > > Config Nr. 0 > used : y > state : RNDIS_DATA_INITIALIZED > medium : 0x00000000 > speed : 425984000 > cable : connected > vendor ID : 0x00000000 > vendor : (null) > > Only when changing the host to a Mac, it's different: > Config Nr. 0 > used : y > state : RNDIS_UNINITIALIZED > medium : 0x00000000 > speed : 425984000 > cable : connected > vendor ID : 0x00000000 > vendor : (null) > > Thanks for any help. Which peripheral controller is this board using? Is it chipidea? dwc2? dwc3? High Speed or Super Speed? -- balbi
