EHCI Gadget Debug: Difference between revisions

Revision as of 18:46, 26 August 2013

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

Download the patches that maintain TTY connected while debug target power-cycles or when host controller is reset.

Apply the patches from one of the v3.8- or v3.10-debug-gadget directories on your kernel build tree.

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 serial option:

        EHCI Debug Device mode (serial)  --->

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

modprobe g_dbgp

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's master (2.6.35)	Lenovo X60	Yes

@@ Line 3: / Line 3: @@
 == Howto ==
+=== Patching ===
+Download the [[:File:Ehci-debug-gadget-patches.tar.gz|patches]] that maintain TTY connected while debug target power-cycles or when host controller is reset.
+Apply the patches from one of the v3.8- or v3.10-debug-gadget directories on your kernel build tree.
 === Compiling ===
 * You need to be familiar with (cross) compiling your kernel.
@@ Line 14: / Line 19: @@
 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):
+Then select the serial option:
-          EHCI Debug Device mode (printk)  --->
+          EHCI Debug Device mode (serial)  --->
 === Loading ===
 Remove all usb gadget drivers such as g_ehter or g_mass_storage with rmmod then do: