Hi All,
I am new guy for ARM development. I am trying to customize _write() to out in display! I have read fully on topic “How to use newlib?” and follow the method, but still fail. Please kindly advise!
“How to use newlib?” link:-
My linking error:-
[src/write.c]
arm-elf-gcc -c -g -mcpu=arm9 -Wall -Iinc src/write.c -o obj/write.o -Wa,-a=lst/write.lst
[sdram: at91sam9_sdram]
arm-elf-ld -v -Map out.map -T elf32-littlearm.lds -o at91sam9_sdram.elf obj/cstartup.o obj/lowlevel.o obj/main.o obj/write.o -L d:\devtools\yagarto\arm-elf\lib -lc -lnosys -lm -lgcc
GNU ld version 2.17
d:\devtools\yagarto\arm-elf\lib\libc.a(syscalls.o): In function `_write’:
newlib-1.14.0/newlib/libc/sys/arm/syscalls.c:333: multiple definition of `_write’
obj/write.o:src/write.c:44: first defined here
arm-elf-ld: Warning: size of symbol `_write’ changed from 120 in obj/write.o to 112 in d:\devtools\yagarto\arm-elf\lib\libc.a(syscalls.o)
arm-elf-ld: cannot find -lgcc
make: *** [sdram] Error 1
make: Target `all’ not remade because of errors.
Probably there is still the default _write() implementation in the library, you should remove the default syscall.o and make your own implementation.
I would like to override _write() funciton in syscalls.o, so that prinf can be out to display.
I would like to override _write() funciton in syscalls.o, so that prinf can be out to display. Any method to do that without recompile newlib. Please kindly advise.