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[Spring Zhang <spring.zhang@xxxxxxxxxx>]

The issue is more possible related with serial port, on my target, it
send a 'ping' but no cmd result resturn before a timeout.

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https://bugs.launchpad.net/bugs/813394

Title:
  waiting for network probing up may fail before default timeout

Status in LAVA Dispatcher:
  New

Bug description:
  I observed wait_network_up could fail on some of my board for the
  network probe up with a latency, it will fail before timeout.

  So a previous patch of mine can't work, I suggest to use
  time.sleep(timeout) to make it more reliable.

  The logs from my board, it only detect 4 times and network reports
  failure, but the timeout is far away reached:

   * Documentation:  http://www.linaro.org
                                                                           [ OK ]
  root@master:~# Waiting for network to come up
  LC_ALL=C ping -W4 -c1 192.168.12.8
  LC_ALL=C ping -W4 -c1 192.168.12.8
  connect: Network is unreachable
  root@master:~# LC_ALL=C ping -W4 -c1 192.168.12.8
  LC_ALL=C ping -W4 -c1 192.168.12.8
  connect: Network is unreachable
  root@master:~# LC_ALL=C ping -W4 -c1 192.168.12.8

  root@master:~# Lava failed at action deploy_linaro_image with error:
  Network can't probe up when deployment

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