[avr-chat] programmer writes BootLoader as ihex file at wrong flash address

[Thomas Richter]

Hi,

I will write a Boot Loader for the ATmega2561. To create it I use 
avr-gcc version 4.1.1 (taken from WinAVR installation version 20070122).
The linker creates an *.elf file (executable and linking format file). I 
have used the start address 0x3E000. The BootLoader Flash Section is 
4096 words wide.

To create the intel hex file I use avr-objcopy (BFD header file version 
2.17 + coff-avr-patch (20050630)) also out from WinAVR installation. The 
resulting Intel Hex file starts with
   :020000023000CC
   :10E000000D9466F00D9483F00D9483F00D9483F0DD
   :10E010000D9483F00D9483F00D9483F00D9483F0B0
and ends with
   :10EAC0000052656164790A0057726F6E67206F703B
   :10EAD00074696F6E2E200A006E6577502E00646F89
   :0AEAE0006E652E00656E642E0000C6
   :040000033000E000E9
   :00000001FF

To program the intel hex file into flash I use AVR Studio Version 4.12, 
Service Pack 4, Build 498.

I do not understand why the programmer writes the BootLoader not to the 
correct flash address. If I read out the complete flash with AVR Studio 
then the BootLoader is placed at 0x1E000 and not a 0x3E000.
Why AVR Studio programs the BootLoader file at wrong address?
Is there an error in the Intel Hex file?
Is AVR Studio the problem? Should I use another tools?

Thanks for any help.

Thomas

PS: Here is the command line output of compiling and linking my 
BootLoader with a Makefile:

P:\>make

-------- begin --------
avr-gcc (GCC) 4.1.1 (WinAVR 20070122)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiling: BootLoader.c
q:/bin/avr-gcc -c -mmcu=atmega2561 -I. -gstabs -DBOOTSIZE=4096 
-DF_CPU=14745600UL  -Os -funsigned-char -funsigned-bitfields 
-fpack-struct -fshort-enums -Wall -Wstrict-prototypes 
-Wa,-adhlns=BootLoader.lst   -MD -MP -MF .dep/BootLoader.o.d 
BootLoader.c -o BootLoader.o

Compiling: uart.c
q:/bin/avr-gcc -c -mmcu=atmega2561 -I. -gstabs -DBOOTSIZE=4096 
-DF_CPU=14745600UL  -Os -funsigned-char -funsigned-bitfields 
-fpack-struct -fshort-enums -Wall -Wstrict-prototypes 
-Wa,-adhlns=uart.lst -MD -MP -MF .dep/uart.o.d uart.c -o uart.o

Compiling: memory.c
q:/bin/avr-gcc -c -mmcu=atmega2561 -I. -gstabs -DBOOTSIZE=4096 
-DF_CPU=14745600UL  -Os -funsigned-char -funsigned-bitfields 
-fpack-struct -fshort-enums -Wall -Wstrict-prototypes 
-Wa,-adhlns=memory.lst   -MD -MP -MF .dep/memory.o.d memory.c -o memory.o

Linking: BootLoader.elf
q:/bin/avr-gcc -mmcu=atmega2561 -I. -gstabs -DBOOTSIZE=4096 
-DF_CPU=14745600UL  -Os -funsigned-char
-funsigned-bitfields -fpack-struct -fshort-enums -Wall 
-Wstrict-prototypes -Wa,-adhlns=BootLoader.o   -MD -MP -MF 
.dep/BootLoader.elf.d BootLoader.o uart.o memory.o  --output 
BootLoader.elf -Wl,-Map=BootLoader.map,--cref    -lm 
-Wl,--section-start=.text=0x3E000

Creating load file for Flash: BootLoader.hex
q:/bin/avr-objcopy -O ihex -R .eeprom BootLoader.elf BootLoader.hex

Creating Extended Listing: BootLoader.lss
q:/bin/avr-objdump -h -S BootLoader.elf > BootLoader.lss

Creating Symbol Table: BootLoader.sym
q:/bin/avr-nm -n BootLoader.elf > BootLoader.sym

Size after:
BootLoader.elf  :
section      size       addr
.data       0x18a   0x800200
.text       0x960    0x3e000
.bss        0x102   0x80038a
.stab      0x195c        0x0
.stabstr    0xfcb        0x0
Total      0x3513

Errors: none
-------- end --------