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* Enable background operation support (in practice, interrupts were correctly
  specified in this case, but SDIODriver requires higher HAL device versions
  before trusting us).
* Set up the GPIO lines controlling the WiFi/Bluetooth module. Previously,
  these were floating, leading to intermittent responses on the SD bus
  depending on recent activity. Pad configuration is copied from the Linux
  device tree, and the pattern of high/low voltages were determined
  empirically.

Version 1.06. Tagged as 'HAL_iMx6-1_06'