$ telnet localhost 4444 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Open On-Chip Debugger > version Open On-Chip Debugger 0.9.0 (2015-05-19-12:09) > reset halt target state: halted target halted due to debug-request, current mode: Thread xPSR: 0xc1000000 pc: 0xfffffffe msp: 0xfffffffc > nrf51 mass_erase > program s210_softdevice.hex verify target state: halted target halted due to debug-request, current mode: Thread xPSR: 0xc1000000 pc: 0xfffffffe msp: 0xfffffffc ** Programming Started ** auto erase enabled Padding image section 0 with 2112 bytes using fast async flash loader. This is currently supported only with ST-Link and CMSIS-DAP. If you have issues, add "set WORKAREASIZE 0" before sourcing nrf51.cfg to disable it target state: halted target halted due to breakpoint, current mode: Thread xPSR: 0x61000000 pc: 0x2000001e msp: 0xfffffffc wrote 50176 bytes from file s210_softdevice.hex in 3.525600s (13.898 KiB/s) ** Programming Finished ** ** Verify Started ** target state: halted target halted due to breakpoint, current mode: Thread xPSR: 0x61000000 pc: 0x2000002e msp: 0xfffffffc target state: halted target halted due to breakpoint, current mode: Thread xPSR: 0x61000000 pc: 0x2000002e msp: 0xfffffffc verified 47900 bytes in 0.483600s (96.727 KiB/s) ** Verified OK ** > program app.hex verify reset target state: halted target halted due to debug-request, current mode: Thread xPSR: 0xc1000000 pc: 0x000006d0 msp: 0x000007c0 ** Programming Started ** auto erase enabled using fast async flash loader. This is currently supported only with ST-Link and CMSIS-DAP. If you have issues, add "set WORKAREASIZE 0" before sourcing nrf51.cfg to disable it target state: halted target halted due to breakpoint, current mode: Thread xPSR: 0x61000000 pc: 0x2000001e msp: 0x000007c0 wrote 6144 bytes from file app.hex in 0.561600s (10.684 KiB/s) ** Programming Finished ** ** Verify Started ** target state: halted target halted due to breakpoint, current mode: Thread xPSR: 0x61000000 pc: 0x2000002e msp: 0x000007c0 verified 5252 bytes in 0.124800s (41.097 KiB/s) ** Verified OK ** ** Resetting Target ** >