VOXL2 Mini Camera Configuration Instability

[Steve Turner]

We are trying to get a 3xTracking and 1x Hi-Res configuration working. Based on testing, it seems this might not be a supported configuration.

• Based on stock bionic Modal kernel and image released
• Based on interface board m0135
  • The Tracker sensor (ov7251) can only be connected to JU (furthest from Qualcomm chip)
  • The HiRes sensor (Imx214) can only be connected to JL, (Closest to the Qualcomm chip)
  • Connecting the wrong sensor to the JU/JL on Voxl2 mini J6 connector will fail to boot and normally require a fast boot to reimage
    • Connecting to J7 does not boot, but generally recovers without fastboot reimage required.
  • If using the m0135 inteface board, one must be fully populated with both a high res and a tracker sensor
    • If using two, the second board should not populate the HiRes sensor
  • Trying to connect two of the same sensors to the interface board will fail, and depending if J6 is used, a fast boot reimage may be required

Reviewing m0014 (tracker) shows the cable is 1 lane CSI with most pins not connected. There is no obvious reason for crashing when connecting to the wrong JU/JL.
Is there something that potentially is causing a hardware fault in this configuration?

The highest sensor configuration we can get working is that above, 1 HiRes and 2 Trackers.

Thanks for any help Modal Team!