Hello Heiko,

Is there a reason why the dtt sensors are initialized and accessed on u-boot startup?

Historical reasons?

The U-Boot Design Principles[1] clearly say:

Initialize devices only when they are needed within U-Boot, i.e. don't initialize the Ethernet interface(s) unless U-Boot performs a download over Ethernet; don't initialize any IDE or USB devices unless U-Boot actually tries to load files from these, etc. (and don't forget to shut down these devices after using them - otherwise nasty things may happen when you try to boot your OS).

Should that be changed?

Yes indeed, the current situation is not consistent with the design principles and thus should be changed. Patches welcome!

Best wishes Detlev