linux-kernel - Re: [PATCH v3 00/12] usb: early: add support for early printk through USB3 debug port

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Date:	Wed, 11 Nov 2015 13:57:11 +0800
From:	"Lu, Baolu" <baolu.lu@...ux.intel.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/12] usb: early: add support for early printk through
 USB3 debug port



On 11/11/2015 10:25 AM, Dave Young wrote:
> [ 1616.823351] usb 2-2: new SuperSpeed USB device number 8 using xhci_hcd
> [ 1616.834520] usb 2-2: LPM exit latency is zeroed, disabling LPM.
> [ 1616.834856] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004
> [ 1616.834858] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 1616.834859] usb 2-2: Product: Remote GDB
> [ 1616.834860] usb 2-2: Manufacturer: Linux
> [ 1616.834860] usb 2-2: SerialNumber: 0001
> [ 1616.836715] usb_debug 2-2:1.0: xhci_dbc converter detected
> [ 1616.837327] usb 2-2: xhci_dbc converter now attached to ttyUSB0
> [ 1622.719311] usb 2-2: USB disconnect, device number 8
  Hi Dave,

I revisited the kernel log. It seems the debug host enumerated
the debug target successfully. Can you please check the
minicom configuration?

The configure on my debug host looks like below.

Welcome to minicom 2.7

OPTIONS: I18n
Compiled on Jan  1 2014, 17:13:19.
Port /dev/ttyUSB0, 01:28:02

Rate: 115200

Please make sure you have disabled runtime power management
for USB devices and host controller in debug host. And sometimes,
reboot the debug host helps when enumeration fails.

Thanks,
Baolu
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