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Linux/CC2650: upload

Part Number: CC2650
Other Parts Discussed in Thread: UNIFLASH

Tool/software: Linux

im not able to upload code using linux command :: its coming up with this error ::

sudo make BOARD=launchpad/cc2650 prog_18.upload PORT=/dev/ttyS0

using saved target 'srf06-cc26xx'
  CC        ../../cpu/cc26xx-cc13xx/lib/cc26xxware/startup_files/ccfg.c
  CC        ../../cpu/cc26xx-cc13xx/./ieee-addr.c
  AR        contiki-srf06-cc26xx.a
  CC        ../../cpu/cc26xx-cc13xx/./fault-handlers.c
  CC        ../../cpu/cc26xx-cc13xx/lib/cc26xxware/startup_files/startup_gcc.c
  CC        prog_18.c
  LD        prog_18.elf
arm-none-eabi-objcopy -O binary --gap-fill 0xff prog_18.elf prog_18.bin
python ../../tools/cc2538-bsl/cc2538-bsl.py -e -w -v -b 115200 -p /dev/ttyS0 prog_18.bin
Opening port /dev/ttyS0, baud 115200
Reading data from prog_18.bin
Firmware file: Raw Binary
Connecting to target...
ERROR: Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)'
../../cpu/cc26xx-cc13xx/Makefile.cc26xx-cc13xx:149: recipe for target 'prog_18.upload' failed
make: *** [prog_18.upload] Error 1
rm obj_srf06-cc26xx/startup_gcc.o prog_18.co obj_srf06-cc26xx/fault-handlers.o