RE: [Fwd: RE: [avr-chat] BOOTLOADER on ATMega644]

[Weddington, Eric]

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden
>  On Behalf Of Robert von Knobloch
> Sent: Monday, December 22, 2008 6:59 AM
> To: address@hidden
> Subject: [Fwd: RE: [avr-chat] BOOTLOADER on ATMega644]
> 
> > -----Original Message-----
> > From: address@hidden 
> > [mailto:address@hidden
> >  On Behalf Of Robert von Knobloch
> > Sent: Monday, December 22, 2008 2:56 AM
> > To: address@hidden
> > Subject: [avr-chat] BOOTLOADER on ATMega644
> > 
> > Hello,
> > 
> > According to the data sheet, the default bootloader area is 0x7000
> > 0x7FFF.
> 
> In WORD ADDRESSES. This is a common user mistake because the 
> data sheet specifies the size of the bootloader area in WORD 
> ADDRESSES. The toolchain works on BYTE ADDRESS. Multiply by 
> two and your starting address is 0xE000, which is the correct address.
> 
> Eric
> 
> Yes Eric, but avr-gcc wants to put it somewhere else entirely:
> 
> /opt/cross/lib/gcc/avr/4.1.2/../../../../avr/bin/ld: section 
> .bootloader
> [00002502 -> 000025ad] overlaps section .data [00002502 -> 0000289d]
> 
> Assuming word address then it wants to put both .data and 
> .bootloader at 0x4A04 Bytes !!!
> 

Did you follow the description in the avr-libc user manual on how to declare 
data in the Program Memory? There is also a tutorial on the AVR Freaks website 
(www.avrfreaks.net) website, in the AVR Tutorials Forum.