Re: [avr-gcc-list] .eeprom section overlapping bootloader linker error

[Theodore A. Roth]

On Thu, 12 Aug 2004, Spencer Hollingum wrote:

> When my eeprom section gets above a certain size I get a linker error. I am
> using an assembler bootloader located at 0x1e00.
> Error goes away if I reduce the eeprom or main code size, in which case
> everyting works fine , main code and bootloader.
>
> Linker Error Message:-
>
> C:\WinAVR\bin\..\lib\gcc-lib\avr\3.3\..\..\..\..\avr\bin\ld.exe: section
> .eeprom
> [00001d0e -> 00001e00] overlaps section .bootloader [00001e00 -> 00001fb7]
> make: *** [main.elf] Error 1
>
> I am using the following linker flags
>
> LDFLAGS = -Wl,-Map=$(TARGET).map,--cref,--section-start=.bootloader=0x1e00
>
> Below is the map file with the section sizes reduced so that the linker
> error does not occur.
>
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .bootloader 000001b8 00001e00 00001e00 00001ed4 2**0
> CONTENTS, ALLOC, LOAD, READONLY, CODE
> 1 .text 00001c8e 00000000 00000000 000000d4 2**1
> CONTENTS, ALLOC, LOAD, READONLY, CODE
> 2 .data 00000080 00800060 00001c8e 00001d62 2**0
> CONTENTS, ALLOC, LOAD, DATA
> 3 .bss 00000266 008000e0 008000e0 0000208c 2**0
> ALLOC
> 4 .noinit 00000000 00800346 00800346 0000208c 2**0
> CONTENTS
> 5 .eeprom 000000f2 00810000 00001d0e 00001de2 2**0
> CONTENTS, ALLOC, LOAD, DATA
> 6 .stab 00005a84 00000000 00000000 0000208c 2**2
> CONTENTS, READONLY, DEBUGGING
> 7 .stabstr 00002745 00000000 00000000 00007b10 2**0
> CONTENTS, READONLY, DEBUGGING
>
>
>
>
>
> The LMA of the .eeprom section is 0x1d0e which means if the .eeprom size
> increases above 0xf2 bytes it will hit the bootloader at 0x1e00. The eeprom
> and bootloader should be in different address spaces so there should be no
> clash.
>
>
>
> Target device is an ATmega8.
>
>
>
> Any suggestions?

This may be a bug in the linker that I think Marek has fixed in
binutils head already (from the ld/ChangeLog):

2004-05-08  Marek Michalkiewicz  <address@hidden>

        * scripttempl/avr.sc: Do not set LMA for "eeprom" section.

If you could see me a very simple program that tickles this, I will try
building it with the binutils head and see if the problem goes away. It
may be a simple matter of using a newer linker script. (I am only making
a guess here, so I could be totally wrong).

---
Ted Roth
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