RE: [avr-gcc-list] ATmega 2561 - compiler generates eicall

[Stu Bell]

Dang, it would help if I read the entire message.

Function pointers in the bootloader. I kept my bootloader
mind-bogglingly simple precisely to avoid problems like this.
Unfortunately, many folks have a need for a far more comples bootloader
than I need.

Since the eicall is being used, why not force EIND to 1 at the beginning
of your code...

    asm volatile ( "ldi  r24, 0x01                      \n\t"
                   "out  0x3C, r24                      \n\t"
                 );

Worth a shot, eh?

Best regards, 

Stu Bell 
DataPlay (DPHI, Inc.) 


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Dusan Ferbas
Sent: Tuesday, June 03, 2008 5:36 PM
To: address@hidden
Subject: [avr-gcc-list] ATmega 2561 - compiler generates eicall

Hi,

I am using WinAVR-20071221, because none of the most recent toolchains
produces a runnable code for our application.

Our bootloader starts at 0x3f800 (2kB).
In its code, we are using function[id](...) construction.
This is compiled with eicall instruction, but no EIND register is set.
Is there a way, how to tell the compiler, that code is linked in upper
half of flash ?
In bootloader code we can live with EIND=1 at its init.

But when we have a call from our application, neither EIND is set, even
address is not divided by 2 (WinAVR bug #1959227).
Probably some far attribute should be applied ?
When compiled for ATmega128 (with 0x1f806), it works ...

typedef void boot_loader_init(unsigned  char *);
#define boot_loader_data_init           ((boot_loader_init *)0x3F806)
...
   boot_loader_data_init(buffer);
...


Dusan  



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