Hi everybody!

I am developing a port of Contiki RTOS for Olimex SAM7-EX256 development board. I am using the previous definition for AT91SAM7Sxx mcu's but modifying the io registers. I have some doubts about this. When I compile with my Makefile:
-----------------------------------------------------------------------
# Default to AT91SAM7S64
SUBTARGET =

### Code common for all ARM CPUs

CONTIKI_CPU_ARM=$(CONTIKI)/cpu/at91sam7x
CONTIKI_CPU_ARM_COMMON=$(CONTIKI)/cpu/arm/common

### Defin the CPU directory
CONTIKI_CPU=$(CONTIKI)/cpu/at91sam7x

### Define the source files we have in the AT91SAM7S port

CONTIKI_CPU_DIRS = . ../common/dbg-io ../common/usb loader

AT91SAM7 = clock.c debug-uart.c interrupt-utils.c sys-interrupt.c rtimer-arch.c rtimer-arch-interrupt.c #uip-log.c spi.c cc2420_spi.c newlib-syscalls.c

APPDIRS += $(CONTIKI)/cpu/at91sam7x

ELFLOADER = elfloader-otf.c elfloader-arm.c #symtab.c cfs-ram.c


#include $(CONTIKI_CPU_ARM_COMMON)/usb/Makefile.usb

#USB += usb-interrupt.c

#include $(CONTIKI_CPU_ARM_COMMON)/SD-card/Makefile.sdcard

#TARGETLIBS = random.c dbg-printf.c dbg-puts.c dbg-putchar.c dbg-sprintf.c dbg-snprintf.c strformat.c

CONTIKI_TARGET_SOURCEFILES += $(AT91SAM7) $(ELFLOADER) #$(TARGETLIBS) \
#$(UIPDRIVERS) $(USB) $(SYSAPPS)

CONTIKI_SOURCEFILES += $(CONTIKI_TARGET_SOURCEFILES)


THREADS =

### Compiler definitions
CC = arm-none-eabi-gcc
LD = arm-none-eabi-ld
AS = arm-none-eabi-as
AR = arm-none-eabi-ar
NM = arm-none-eabi-nm
OBJCOPY = arm-none-eabi-objcopy
STRIP = arm-none-eabi-strip

XSLTPROC=xsltproc

PROJECT_OBJECTFILES += ${addprefix $(OBJECTDIR)/,$(CONTIKI_TARGET_MAIN:.c=.o)}

LINKERSCRIPT = $(CONTIKI_CPU)/atmel-rom.ld

STARTUP=${addprefix $(OBJECTDIR)/,Cstartup_SAM7.o}

# JTAG program upload
OPENOCD = openocd
OPENOCD_DIR = $(CONTIKI_CPU)/openocd/
OPENOCD_CFG = arm7_wig.cfg

OPENOCD_FLASH_CFG = arm7_wig_flash.cfg

# USB program upload
SAMIAM=Sam_I_Am
SAMIAM_TTY=/dev/ttyACM0

ARCH_FLAGS= -mcpu=arm7tdmi -mthumb-interwork
THUMB_FLAGS=-mthumb
ARM_FLAGS=


CFLAGSNO = -I. -I$(CONTIKI)/core -I$(CONTIKI_CPU) \
-I$(CONTIKI_CPU)/dbg-io \
-I$(CONTIKI)/platform/$(TARGET) \
${addprefix -I,$(APPDIRS)} \
-DWITH_UIP -DWITH_ASCII -DMCK=$(MCK) \
-Wall $(ARCH_FLAGS) -g -D SUBTARGET=$(SUBTARGET)

CFLAGS += $(CFLAGSNO) -O -DRUN_AS_SYSTEM -DROM_RUN
LDFLAGS += -L $(CONTIKI_CPU) -T $(LINKERSCRIPT) -nostartfiles

CDEPFLAGS = $(CFLAGS) -D __MAKING_DEPS__




### Setup directory search path for source files

CUSTOM_RULE_C_TO_OBJECTDIR_O=yes
CUSTOM_RULE_C_TO_O=yes

%-interrupt.o: %-interrupt.c
$(CC) $(CFLAGS) $(ARM_FLAGS) $< -c

$(OBJECTDIR)/%-interrupt.o: %-interrupt.c
$(CC) $(CFLAGS) $(ARM_FLAGS) -c $< -o $@

%-arm.o: %-arm.c
$(CC) $(CFLAGS) $(ARM_FLAGS) $< -c

$(OBJECTDIR)/%-arm.o: %-arm.c
$(CC) $(CFLAGS) $(ARM_FLAGS) -c $< -o $@

$(OBJECTDIR)/interrupt-utils.o: interrupt-utils.c
$(CC) $(CFLAGS) $(ARM_FLAGS) $< -c -o $@

%.o: %.c
$(CC) $(CFLAGS) $(THUMB_FLAGS) $< -c

$(OBJECTDIR)/%.o: %.c
$(CC) $(CFLAGS) $(THUMB_FLAGS) -c $< -o $@

CUSTOM_RULE_S_TO_OBJECTDIR_O = yes
%.o: %.S
$(CC) $(CFLAGS) $(ARM_FLAGS) $< -c

$(OBJECTDIR)/%.o: %.S
$(CC) $(CFLAGS) $(ARM_FLAGS) $< -c -o $@


CUSTOM_RULE_C_TO_CO=yes

%.co: %.c
$(CC) $(CFLAGS) $(THUMB_FLAGS) $< -c -o $@

CUSTOM_RULE_C_TO_CE=yes

%.ce: %.o
$(LD) $(LDFLAGS) --relocatable -T $(CONTIKI_CPU)/merge-rodata.ld $< -o $@
$(STRIP) -K _init -K _fini --strip-unneeded -g -x $@

CUSTOM_RULE_LINK=yes

%-stripped.o: %.c
$(CC) $(CFLAGS) -c $< -o $@
$(STRIP) --strip-unneeded -g -x $@

%-stripped.o: %.o
$(STRIP) --strip-unneeded -g -x -o $@ $<

%.o: ${CONTIKI_TARGET}/%.S
$(AS) -o $(notdir $(<:.S=.o)) $<

%-nosyms.$(TARGET): %.co $(PROJECT_OBJECTFILES) contiki-$(TARGET).a $(STARTUP) $(OBJECTDIR)/empty-symbols.o
$(CC) $(LDFLAGS) $(CFLAGS) -nostartfiles -o $@ $(filter-out %.a,$^) $(filter %.a,$^) -lc $(filter %.a,$^)


%.ihex: %.$(TARGET)
$(OBJCOPY) $^ -O ihex $@

%.bin: %.$(TARGET)
$(OBJCOPY) -O binary $< $@

.PHONY: symbols.c
ifdef CORE
%.$(TARGET): %.co $(PROJECT_OBJECTFILES) contiki-$(TARGET).a $(STARTUP) $(OBJECTDIR)/symbols.o
$(CC) $(LDFLAGS) $(CFLAGS) -nostartfiles -o $@ $(filter-out %.a,$^) $(filter %.a,$^) -lc $(filter %.a,$^)

symbols.c: $(CORE)
$(NM) $< | awk -f $(CONTIKI_CPU)/builtins.awk -f ../../tools/mknmlist > symbols.c

else
%.$(TARGET): %-nosyms.$(TARGET)
ln -sf $< $@
endif

empty-symbols.c:
@${CONTIKI}/tools/make-empty-symbols


upload_ocd_%: %.bin
# Clear lock bits
$(OPENOCD) -s $(OPENOCD_DIR) -f $(OPENOCD_CFG) -c init -c "halt;mww 0xffffff64 0x5a000004;sleep 250;mww 0xffffff64 0x5a002004; sleep 250;flash probe 0;flash write_bank 0 $< 0x0;reset run;sleep 500;exit"



upload_%: %.ihex
# Clear lock bits
$(SAMIAM) "open $(SAMIAM_TTY) , writew 0xffffff64 5a000004"
$(SAMIAM) "open $(SAMIAM_TTY) , writew 0xffffff64 5a002004"
$(SAMIAM) "open $(SAMIAM_TTY) , flash $< , go"

ocd_reset:
cd $(CONTIKI_CPU)/openocd;$(OPENOCD) -f $(OPENOCD_CFG) -c init -c reset -c exit

# Don't use core/loader/elfloader.c, use elfloader-otf.c instead
$(OBJECTDIR)/elfloader.o:
echo -n >$@

clean: clean_cpu

.PHONY: clean_cpu

clean_cpu:
-rm -rf $(BUILTSRCDIR)

.PRECIOUS: %-nosyms.$(TARGET)
-----------------------------------------------------------------------

I obtain this output on my console:
-----------------------------------------------------------------------
bj_sam7ex256/Cstartup_SAM7.o obj_sam7ex256/empty-symbols.o contiki-sam7ex256.a -lc contiki-sam7ex256.a
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
sbrkr.c:(.text+0x18): undefined reference to `_sbrk'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-writer.o): In function `_write_r':
writer.c:(.text+0x20): undefined reference to `_write'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-closer.o): In function `_close_r':
closer.c:(.text+0x18): undefined reference to `_close'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-fstatr.o): In function `_fstat_r':
fstatr.c:(.text+0x1c): undefined reference to `_fstat'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-isattyr.o): In function `_isatty_r':
isattyr.c:(.text+0x18): undefined reference to `_isatty'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-lseekr.o): In function `_lseek_r':
lseekr.c:(.text+0x20): undefined reference to `_lseek'
/home/xxxx/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib/libc.a(lib_a-readr.o): In function `_read_r':
readr.c:(.text+0x20): undefined reference to `_read'
collect2: ld returned 1 exit status
make: *** [hello-world-nosyms.sam7ex256] Error 1
rm hello-world.co obj_sam7ex256/Cstartup_SAM7.o obj_sam7ex256/empty-symbols.o
-----------------------------------------------------------------------

I have compiled with another toolchain and i have the same error. Do you know what is the possible cause?

Thanks and if you want colaborate with this port I will be very thankful!

Hi;
How far do you get with your porting? I'm also working on porting contiki to ATSAM7x-EK board. Since we are using the same MCU, I hope to be able to leverage some of your works in the cpu directory. What about the platform directory, do you have makefile.<platform> and entry code that I can use for reference.

Thanks;
Sony

look for syscalls.c or use the dbgu code