Zero: Additional USB port not recognized on boot, needs replug

cvxx · May 5, 2017

Hi,

I have connected additional USB port on the GPIO header. The port works fine when I plug something on a running system. But if the device is connected before powering Zero - port does not recognize the device. So I need always unplug and plug back after rebooting.

Boot with device connected:

[   63.360183] usb 7-1: device descriptor read/64, error -110
[   63.650188] usb 7-1: new full-speed USB device number 3 using sunxi-ohci
[   64.370172] eth0: no IPv6 routers present
[   78.830243] usb 7-1: device descriptor read/64, error -110
[   94.120185] usb 7-1: device descriptor read/64, error -110
[   94.410620] usb 7-1: new full-speed USB device number 4 using sunxi-ohci
[  104.830295] usb 7-1: device not accepting address 4, error -110
[  105.010283] usb 7-1: new full-speed USB device number 5 using sunxi-ohci
[  115.430172] usb 7-1: device not accepting address 5, error -110
[  115.437760] hub 7-0:1.0: unable to enumerate USB device on port 1

Unplugging and immediately plugging back:

[ 7105.464608] ohci_irq: fullspeed or lowspeed device disconnect
[ 7105.464655] ehci_irq: highspeed device connect
[ 7105.480187] ehci_irq: highspeed device disconnect
[ 7105.614571] ehci_irq: highspeed device disconnect
[ 7107.123168] ehci_irq: highspeed device connect
[ 7107.400250] usb 3-1: new high-speed USB device number 4 using sunxi-ehci
[ 7107.640543] rtl8192cu: Chip version 0x10
[ 7107.747882] rtl8192cu: MAC address: 00:13:ef:60:0b:fd
[ 7107.747906] rtl8192cu: Board Type 0
[ 7107.748118] rtlwifi: rx_max_size 15360, rx_urb_num 8, in_ep 1
[ 7107.748252] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
[ 7107.748730] usbcore: registered new interface driver rtl8192cu
[ 7107.752527] ieee80211 phy2: Selected rate control algorithm 'rtl_rc'
[ 7107.770511] rtlwifi: wireless switch is on

Is there a way to fix it so device is always recognized during boot?

If not - is there at least a way to soft-unplug/plug usb device without having physical access to the board?

Thanks