linux-kernel - Re: Missing USB XHCI and EHCI reset for kexec

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Message-ID: <Pine.LNX.4.44L0.1404132213290.24243-100000@netrider.rowland.org>
Date:	Sun, 13 Apr 2014 22:14:51 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Stefani Seibold <stefani@...bold.net>
cc:	linux-usb <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, <sarah.a.sharp@...ux.intel.com>
Subject: Re: Missing USB XHCI and EHCI reset for kexec

On Sun, 13 Apr 2014, Stefani Seibold wrote:

> When executing a kexec kernel on a PowerPC board the new started kernel
> will not find already enumerated USB devices due a missing reset on the
> USB bus.

How do you know the problem is caused by a missing reset?

Can you post the dmesg log from the kexec-ed kernel, with 
CONFIG_USB_DEBUG enabled?

Alan Stern

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