[avr-gcc-list] memcpy_P on XMega

[Johannes Bauer]

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Hi there,

I've had some trouble today with the XMega. I used memcpy_P, which
usually worked just fine, except for a certain part of my code where it
suddenly produced garbled output. Tracing the source of the problem I
noticed that on the ATxmega I use the NVM.CMD register and set it to
reading the calibration row (0x02). However, since I did not return it
to NOP (0x00), subsequent calls to memcpy_P lead to a wrong result,
since the behaviour of lpm has changed with a changed NVM.CMD.

I suggest on the XMega to set NVM.CMD to zero in the beginning of memcpy
or include this in the docs, as it might cost someone else roughly a day
in debugging time :-/

Regards,
Johannes
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