Hi Frank, On 03/22/2013 04:45 AM, Frank Rowand wrote: > On 03/21/13 07:41, Alan Stern wrote: >> 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. > > My PandaBoard builds fail on 3.9-rcX due to ARM multiplatform issues. > Either there is something I need to change about the way I build it, > or it is broken (that is a side issue). My simple expedient was to > hack around multiplatform, and just make it build (patch below if > anyone else wants a _temporary_ hack). This is a known issue and will be resolved the proper way in 3.10. For 3.9 you could also use a temporary fix posted here http://thread.gmane.org/gmane.linux.usb.general/82693/ > > The problem appears to not be present in 3.9-rc3. In older kernel versions, > the worst case to see the problem was 18 boots. For 3.9-rc3 I booted 42 > times without seeing the problem. This is good to hear. > > The problem occurs at least up through 3.8. I'll try to reverse bisect > between 3.8 and 3.9-rc3 to see when the problem disappeared (I'm running > short of time, so no promises for a near term result). Thanks for the tests. There were a lot of OMAP EHCI related cleanup/fixes [1] that went into 3.9. It would be interesting to know what fixed it. [1] - https://lkml.org/lkml/2013/1/23/155 cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
