#!/bin/bash

# Verify network device exists, and reboot if it does not

# This is a workaround for the case where the PCIe phy does not initialize,
# which happens a few percent of the time. The user-facing effect is that
# startup takes about 20 seconds longer if the phy does not initialize.
#
# It would be better to do this from the initrd.
#
# It would be better still to fix the PCIe driver to reset and try again (or
# something). Simple fixes (e.g. increasing the training time) did not work.
# The imx6 PCIe driver in the 3.14.38 BSP is considerably different from the
# one in the 3.10.17 BSP, so perhaps it will be fixed when we update.

kmsg() {
  echo "$@" > /dev/kmsg
}

# wlan0 exists on both solo and controller
# (although normally it is not used on controller)
kmsg -n "Checking wlan0... "

if [ ! -e /sys/class/net/wlan0 ]; then
  kmsg "NOT FOUND"
  # all logs except boot have been rotated at this point;
  # stop and rotate it keep them all in sync
  /etc/init.d/bootlogd stop
  shutdown -r now
  # don't let any more startup scripts start
  sleep 60
else
  kmsg "OK"
fi