AW: [avr-gcc-list] Using current avr-gcc for target ATmega2561

[Haase Bjoern (PT-BEU/EMT) *]

Possibly the WiKi is not quite up to date.

 

Please correct me, but it was my impression that the general opinion was that the 4-byte alignment method will be less efficient and more difficult to implement.

 

1.) IMO the fastest way will be to insert jump stubs to the function entry point in the lower 128k as part of the prologues

2.) Change the tablejump and casesi instruction patterns so that they work also on the larger devices

3.) Correct the call patterns so that they directly call the function body in the higher memory areas and not the jump stubs

 

4.) add support within the binutils for a new class avr6

5.) make the necessary modifications in avr-libc for the larger devices (include header files and change the loop for the initialized ram variables such that it uses 3-byte LPM because the initialization data end up at the very end of the flash.

 

I am working on 1-3.

 

Bjoern.