Hi.

> Is there a comprehensive list of problematic functions? (I know all 
> functions using RAMPZ, but maybe someone assembled a list. )
> Would it be reasonable to turn off and recover interrupts during these 
> commands by default?

  avr-gcc starting with 4.3 save/restore RAMPZ register in interrupt handler 
routines if Z register is used in them. Now pgm_read_*_far functions is 
reentrant.

Anatoly.
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