These are the commands I use to flash a nuttx.bin firmware in the STM32F407 microcontroller:
$ JLinkExe -if SWD
SEGGER J-Link Commander V4.98e ('?' for help)
Compiled May 5 2015 11:49:39
DLL version V4.98e, compiled May 5 2015 11:49:35
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware: V8.00
S/N: 268006167
OEM: SEGGER-EDU
Feature(s): FlashBP, GDB
VTarget = 0.200V
J-Link>exit
$ sudo JLinkExe
SEGGER J-Link Commander V4.98e ('?' for help)
Compiled May 5 2015 11:49:39
DLL version V4.98e, compiled May 5 2015 11:49:35
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware: V8.00
S/N: 268006167
OEM: SEGGER-EDU
Feature(s): FlashBP, GDB
VTarget = 3.300V
Info: TotalIRLen = 9, IRPrint = 0x0011
Info: Found Cortex-M4 r0p1, Little endian.
Info: FPUnit: 6 code (BP) slots and 2 literal slots
Info: CoreSight components:
Info: ROMTbl 0 @ E00FF000
Info: ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 000BB00C SCS
Info: ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 003BB002 DWT
Info: ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
Info: ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 003BB001 ITM
Info: ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 000BB9A1 TPIU
Info: ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 000BB925 ETM
Found 2 JTAG devices, Total IRLen = 9:
#0 Id: 0x4BA00477, IRLen: 04, IRPrint: 0x1, CoreSight JTAG-DP (ARM)
#1 Id: 0x06413041, IRLen: 05, IRPrint: 0x1, STM32 Boundary Scan
Cortex-M4 identified.
Target interface speed: 100 kHz
J-Link> device stm32f407ve
Info: Device "STM32F407VE" selected.
Reconnecting to target...
Info: TotalIRLen = 9, IRPrint = 0x0011
Info: TotalIRLen = 9, IRPrint = 0x0011
Info: Found Cortex-M4 r0p1, Little endian.
Info: FPUnit: 6 code (BP) slots and 2 literal slots
Info: CoreSight components:
Info: ROMTbl 0 @ E00FF000
Info: ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 000BB00C SCS
Info: ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 003BB002 DWT
Info: ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
Info: ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 003BB001 ITM
Info: ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 000BB9A1 TPIU
Info: ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 000BB925 ETM
J-Link> loadbin ./nuttx.bin 0
Halting CPU for downloading file.
Downloading file [./nuttx.bin]...Info: J-Link: Flash download: Flash programming performed for 1 range (65536 bytes)
Info: J-Link: Flash download: Total time needed: 9.917s (Prepare: 0.678s, Compare: 0.016s, Erase: 1.447s, Program: 7.687s, Verify: 0.006s, Restore: 0.081s)
O.K.
J-Link>
Alan C. Assis 