From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965321Ab2EQJAt (ORCPT ); Thu, 17 May 2012 05:00:49 -0400 Received: from mail-qc0-f174.google.com ([209.85.216.174]:43339 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177Ab2EQJAo (ORCPT ); Thu, 17 May 2012 05:00:44 -0400 Message-ID: <4FB4CA08.7090600@gmail.com> Date: Thu, 17 May 2012 17:51:04 +0800 From: Xiao Jiang User-Agent: Thunderbird 2.0.0.24 (X11/20101027) MIME-Version: 1.0 To: Ming Lei CC: steve.glendinning@smsc.com, gregkh@linuxfoundation.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/1] smsc95xx: add FLAG_POINTTOPOINT flag for driver_info References: <1337155302-26244-1-git-send-email-jgq516@gmail.com> <4FB4613B.3020603@gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ming Lei wrote: > On Thu, May 17, 2012 at 10:23 AM, Xiao Jiang wrote: > >> Ming Lei wrote: >> >>> On Wed, May 16, 2012 at 4:01 PM, wrote: >>> >>> >>>> From: Xiao Jiang >>>> >>>> commit c26134 introduced FLAG_POINTTOPOINT flag for USB ethernet devices >>>> which possibly use "usb%d" names, add this flag to make sure pandaboard >>>> can mount nfs with smsc95xx NIC. >>>> >>>> >>> Without the flag, I also can mount nfs successfully on my Pandaboard... >>> > > I always mount nfs in console, and not tried to mount nfs as root fs. > > >>> >> I have pulled latest tree >> (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git >> commit 0e93b4b304ae052ba1bc73f6d34a68556fe93429), and enable related options >> (USB_NET_SMSC95XX, >> USB_EHCI_HCD and USB_EHCI_HCD_OMAP) with omap2plus_config, However the >> kernel still can't mount >> nfs, pls see below infos. >> >> [ 3.114105] smsc95xx v1.0.4 >> [ 4.533752] smsc95xx 1-1.1:1.0: *eth0*: register 'smsc95xx' at >> usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, fe:b9:1b:07:8e:d1 >> [ 108.854217] VFS: Unable to mount root fs via NFS, trying floppy. >> [ 108.861114] VFS: Cannot open root device "nfs" or unknown-block(2,0): >> error -6 >> [ 108.868713] Please append a correct "root=" boot option; here are the >> available partitions: >> [ 108.877655] b300 7761920 mmcblk0 driver: mmcblk >> [ 108.883239] b301 40131 mmcblk0p1 >> 00000000-0000-0000-0000-000000000mmcblk0p1 >> [ 108.891662] b302 7719232 mmcblk0p2 >> 00000000-0000-0000-0000-000000000mmcblk0p2 >> [ 108.900146] Kernel panic - not syncing: VFS: Unable to mount root fs on >> unknown-block(2,0) >> >> BTW: I tested it with OMAP4430 ES2.2 pandaboard, the issue can be solved >> with apply the patch. >> >> Is there something which I missed? thanks. >> > > What is your kernel parameter? Maybe you use 'usb%d' in kernel parameter for > mounting nfs as root fs. If so, could you try 'eth%d' in kernel cmd? > > In fact, smsc95xx is a real LAN interface, and 'eth%d' should be prefered name > as described in changelog of commit > c261344d3ce3edac781f9d3c7eabe2e96d8e8fe8(usbnet:use eth%d name for > known ethernet devices) > > Thanks for your notice, I used wrong kernel parameter. Regards, Xiao > Thanks, >