Hi Ken,
avr-as a.S -o a.o
avr-ld -m avr4 -Tdata 0x800100 -o a.elf a.o
avr-objdump -d a.elf > a.lst
avr-ld -m avr4 -Tdata 0x800100 -o a.hex --oformat=ihex a.o
The list file shows both opcodes correctly, "a0 31". But in the hex file
the first one is wrong, "B031", while the second one is correct, "A031".
The difference is that avr-ld had to do a relocation for the first one.
Running "avr-objdump -r a.o" shows one record with type R_AVR_LO8_LDI
relocation, value __bss_end.
R_AVR_LO8_LDI is performed in binutils-2.16.1/bfd/elf32-avr.c. It works
correctly for the default ELF format, but fails for the IHEX format.
This is progress, but I'm still stumped.
It is quite common that LD is unable to correctly translate binary file
formats and link at the same time. Quite a few targets suffer from this
problem. The simplest workaround is to perform the link first and then
use objcopy to perform the binary translation. ie:
avr-ld -m avr4 -Tdata 0x800100 -o a.elf a.o
avr-objcopy --output-target ihex a.elf a.ihex
Cheers
Nick
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