RE: [avr-gcc-list] String in flash access in Boot Loader Atmega1280

[Schwichtenberg, Knut]

Yannick,

 

and here is another solution: Forget the bootloader section. Use the text section instead. Now if the object files are created rename the the section in the makefile.

 

Makefile snipet example:

 

%.o : %.c
 @echo
 @echo $(MSG_COMPILING) $<
 $(CC) -c $(CFLAGS) $< -o $@
 cp $@ $*_text.o
 $(OBJCOPY) --rename-section .text=.bootloader $@ $@

 

 With the last line you rename the section to booloader and that's it. All functions xxx_P, PROGMEM and so on work as expectected.  avr-objcopy does the job.

 

Knut

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From: address@hidden [mailto:address@hidden On Behalf Of Yannick PODGORSKI
Sent: Monday, September 24, 2007 4:50 PM
To: address@hidden
Subject: [avr-gcc-list] String in flash access in Boot Loader Atmega1280

Hello,

I try to program a boot loader on Atmega1280.

My configuration :

 - linux Fedora Core 7,

 - avr libc 1.4.6,

 - avrdude 5.3.1,

 - avrgcc 4.2.0.

I use the program in application section and there is no problem.

When I try to use it in boot loader section, the program starts but I can't access to string in flash.

I use pgm_read_byte_far().

 

 

Yannick PODGORSKI.

Kuantic.