AVR-Chat

Hi,

To answer my own question- it seems like the cause
is a possible bug in the avr-gcc toolset in file

/usr/avr/include/avr/iom8.h

This file states

#define UCSRC	_SFR_IO8(0x20)
#define UBRRH	_SFR_IO8(0x20)

(Twice the same definition for different ports?
Suspicious...)

To make ATmega8 USART functionality work for avr-gcc,
I changed these two lines to the following:

#define UCSRC   _SFR_IO8(0x03)
#define UBRRH   _SFR_IO8(0x02)

After these changes, I can compile my code (which
used to work on ATtiny2313) with -mmcu=atmega8 and
it will work on the ATmega8.

Hope this helps someone!

Best,
Marc