Re: [Simulavr-devel] Support for atmega2560?

[ThomasK]

Hi Markus,

> > > WARNING: file rwmem.cpp: line 231: Invalid write access to IO[0x90]=0x1, 
> > > PC=0x3ba6
> > > WARNING: file rwmem.cpp: line 231: Invalid write access to IO[0x91]=0x9, 
> > > PC=0x3bac
> > > WARNING: file rwmem.cpp: line 231: Invalid write access to IO[0x71]=0x0, 
> > > PC=0x3bb0
> You assume here these addresses are reported correctly. However, the 1284 needs 
> 16 bit addresses while the 644 gets away with 15 bit ones. What if the 16 bit 
> ones are assumed to be 15 bit?

If you look to datasheet for 1284 *and* 644, then you'll see, that IO 
address 0x190, 0x191 and 0x171 are reserved, eg. not assigned to a 
peripheral unit. But 0x90 is TCCR3A, 0x91 TCCR3B and 0x71 TIMSK3. (all 3 
are not/not right assigned in simulavr code - this is really a bug!) So 
I don't think, that this is a problem of wrong masking out higher bits 
that bit7. *Maybe* it's a decoding problem, but then it would be good, 
to know, which memonic (eg. machine code) bring this messages. So, for 
me it's unclear, why it should work on 644, but not on 1284.

cu, Thomas