EHCI Gadget Debug

Introduction

This page is about using embedded GNU/Linux devices in order to get the USB debug logs.

Howto

Compiling

• You need to be familiar with (cross) compiling your kernel.
• (Cross) compile it as usual but during the configuration do the following:

Go into Device Drivers:

Device Drivers  --->

Then go into USB support:

[*] USB support  --->

Then go into USB Gadget Support:

<M>   USB Gadget Support  --->

Then enable the following option:

<M>     EHCI Debug Device Gadget

Then select the printk option for now(a bug has to be fixed to make serial option work properly):

        EHCI Debug Device mode (printk)  --->

Loading

Remove all usb gadget drivers such as g_ehter or g_mass_storage with rmmod then do:

modprobe g_dbgp

Finding the USB debug port

See EHCI Debug Port#Finding the USB debug port

Tested hardware

Brand and Device	kernel used	Target devices	works?
Goldelico GTA04 A3	neil-plus kernel and branch (3.7)	Lenovo X60	Yes
Buglabs's bug 2.0	bug20-2.6.35-linaro + some commits on top (2.6.35)	Lenovo X60	Yes