[yocto] USB Ethernet problems

[Gary Thomas]

On 2013-04-05 06:57, Hans Beckérus wrote:
>
>
> On Fri, Apr 5, 2013 at 2:48 PM, Gary Thomas <gary at mlbassoc.com <mailto:gary at mlbassoc.com>> wrote:
>
>     On 2013-04-05 06:38, Hans Beckérus wrote:
>
>
>
>         On Fri, Apr 5, 2013 at 12:16 PM, Gary Thomas <gary at mlbassoc.com <mailto:gary at mlbassoc.com> <mailto:gary at mlbassoc.com <mailto:gary at mlbassoc.com>>> wrote:
>
>              On 2013-04-05 03:08, Hans Beckérus wrote:
>
>                  Hi. In our configuration we do not have an on-board Ethernet device. It connected to the USB-host adapter.
>                  It seems that probing of such devices are done very late in the kernel boot-up which means it gets out of sync with the network init script(s)
>                  and the NIC thus has to be brought up manually after boot.
>
>                  ...
>                  usb 1-1: new high-speed USB device number 2 using xusbps-ehci
>                  hub 1-1:1.0: USB hub found
>                  hub 1-1:1.0: 4 ports detected
>                  VFS: Mounted root (ext2 filesystem) on device 1:0.
>                  devtmpfs: mounted
>                  Freeing init memory: 152K
>                  INIT: version 2.88 booting
>                  usb 1-1.4: new high-speed USB device number 3 using xusbps-ehci
>                  Starting Bootlog daemon: bootlogd: cannot allocate pseudo tty: No such file or directory
>                  bootlogd.
>                  Configuring network interfaces... ifconfig: SIOCGIFFLAGS: No such device
>                  INIT: Entering runlevel: 5
>                  Starting Dropbear SSH server: NET: Registered protocol family 10
>                  dropbear.
>                  Starting syslogd/klogd: done
>                  Stopping Bootlog daemon: bootlogd.
>                  asix 1-1.4:1.0: eth0: register 'asix' at usb-xusbps-ehci.0-1.4, ASIX AX88772 USB 2.0 Ethernet, fc:75:16:cf:6a:86
>                  ...
>
>                  Is there some way to configure a system through Yocto to handle this scenario?
>
>
>              I run exactly this setup on many different platforms with no issues
>              so it can definitely be done with Poky/Yocto.
>
>              What system (target) are you using?
>              What version of the metadata (Poky/Yocto) are you using?  master?  danny?  etc
>              How is your network device configured?
>
>         I am on branch master.
>         My network device is *not* configured. That is the whole point/?problem?. The kernel knowns nothing about the NIC at boot.
>         It is not detected until it first detects the USB 2.0 host adapter. Then after a few moments the NIC is probed and eth0 becomes available through the ASIX driver. But its
>         too late,
>         the /etc/init.d/networking is already done trying ifup :(
>         Is there some configuration on network level I can do to fix this? Right now I have an ugly patch in /etc/init.d/networking that spins until eth0 comes up. It solves the sync
>         issue, but also requires some sort of timeout to not get stuck forever if the device is never inserted :(
>
>
>     Is your ethernet driver compiled in or a kernel module?
>
>     I'm using a compiled in driver (the same one BTW) and it works fine.
>
>
> It is compiled into the kernel. If you look at boot log I sent in the initial mail you can see that the actual ASIX device (D-Link DUB-E100) is detected much later than the host
> adapter :( How is it in your case?
> Maybe it is the actual device that is not responding quickly enough? Are you pre-configuring anything in your bootargs prepared from U-Boot for eth?

No, I don't do anything special at all.  My boot log is attached.
You can see that the interface (on the USB) is found quite early.
That said, the system works fine even if I plug it in later on.

You still did not show us your '/etc/network/interfaces' file.
Mine contains these lines which make it handle the network device
coming and going:
   # Wired interface (on optional board)
   auto eth0
   iface eth0 inet dhcp


-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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