On Wed, 20 Mar 2013, Frank Rowand wrote: > Hi All, > > Not quite sure quite where the problem is (USB, OMAP, smsc95xx driver, other???), > so casting the nets wide... > > The PandaBoard frequently fails to boot with an eth0 error when mounting > the root file system via NFS (ethernet driver fails due to a USB timeout; > no ethernet means NFS won't work). A typical set of error messages is: > > [ 3.264373] smsc95xx 1-1.1:1.0: usb_probe_interface > [ 3.269500] smsc95xx 1-1.1:1.0: usb_probe_interface - got id > [ 3.275543] smsc95xx v1.0.4 > [ 8.078674] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, 82:b9:1d:fa:67:0d > [ 8.091003] hub 1-1:1.0: state 7 ports 5 chg 0000 evt 0002 > [ 13.509918] usb 1-1.1: swapper/0 timed out on ep0out len=0/4 > [ 13.515869] smsc95xx 1-1.1:1.0: eth0: Failed to write register index 0x00000108 > [ 13.523559] smsc95xx 1-1.1:1.0: eth0: Failed to write ADDRL: -110 > [ 13.529998] IP-Config: Failed to open eth0 > > I have bisected this to: > > commit 18aafe64d75d0e27dae206cacf4171e4e485d285 > Author: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Date: Wed Jul 11 11:23:04 2012 -0400 > > USB: EHCI: use hrtimer for the I/O watchdog I don't understand how that commit could cause a timeout unless there are at least two other bugs present in your system. > Note that to compile this version of the kernel, an additional fix must > also be applied: > > commit ba5952e0711b14d8d4fe172671f8aa6091ace3ee > Author: Ming Lei <ming.lei@xxxxxxxxxxxxx> > Date: Fri Jul 13 17:25:24 2012 +0800 > > USB: ehci-omap: fix compile failure(v1) > > The symptom can be worked around by retrying the USB access if a timeout > occurs. This is clearly _not_ the fix, just a hack that I used to > investigate the problem: > > http://article.gmane.org/gmane.linux.rt.user/9773 > > My kernel configuration is: > > arch/arm/configs/omap2plus_defconfig > > plus to get the ethernet driver I add: > > CONFIG_USB_EHCI_HCD > CONFIG_USB_NET_SMSC95XX > > I found the problem on 3.6.11, but have not replicated it on 3.9-rcX > yet because my config fails to build on 3.9-rc1 and 3.9-rc2. I'll try > to work on that issue tomorrow. Let me know how it works out. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
