On Thu, May 17, 2012 at 10:23 AM, Xiao Jiang <jgq516@xxxxxxxxx> wrote: > Ming Lei wrote: >> >> On Wed, May 16, 2012 at 4:01 PM, <jgq516@xxxxxxxxx> wrote: >> >>> >>> From: Xiao Jiang <jgq516@xxxxxxxxx> >>> >>> 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, -- Ming Lei -- 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
