The configuration in cleanflight is stored at the end of the flash ram, currently it uses 2-4KB of flash depending on the target.

Sometimes it's necessary to erase this during development.

Erasing

Generate a 2-4kb blank file.

2kb: ``` dd if=/dev/zero of=obj/blankconfig.bin bs=1024 count=2 ```

4kb: ``` dd if=/dev/zero of=obj/blankconfig.bin bs=1024 count=4 ```

Overwrite configuration using JLink

Run JLink (OSX: /Applications/SEGGER/JLink/JLinkExe)

Execute commands device <your device>, e.g. STM32F303CB r h loadbin obj/blankconfig.bin, <address> r to Reboot FC. q to quit

the address is the address of the end of the flash ram minus the size of the configuration.

example addresses: ``` 64k device/2kb config = 0x800F800 128k device/2kb config = 0x801F800 128k device/4kb config = 0x801F000 256k device/2kb config = 0x803f800 256k device/4kb config = 0x803f000 ```

Example session

``` $ /Applications/SEGGER/JLink/JLinkExe SEGGER J-Link Commander V4.90c ('?' for help) Compiled Aug 29 2014 09:52:38 DLL version V4.90c, compiled Aug 29 2014 09:52:33 Firmware: J-Link ARM-OB STM32 compiled Aug 22 2012 19:52:04 Hardware: V7.00 S/N: -1 Feature(s): RDI,FlashDL,FlashBP,JFlash,GDBFull VTarget = 3.300V Info: Could not measure total IR len. TDO is constant high. Info: Could not measure total IR len. TDO is constant high. No devices found on JTAG chain. Trying to find device on SWD. Info: Found SWD-DP with ID 0x2BA01477 Info: Found Cortex-M4 r0p1, Little endian. Info: FPUnit: 6 code (BP) slots and 2 literal slots Info: TPIU fitted. Info: ETM fitted. Cortex-M4 identified. Target interface speed: 100 kHz J-Link>device STM32F303CC Info: Device "STM32F303CC" selected (256 KB flash, 32 KB RAM). Reconnecting to target... Info: Found SWD-DP with ID 0x2BA01477 Info: Found SWD-DP with ID 0x2BA01477 Info: Found Cortex-M4 r0p1, Little endian. Info: FPUnit: 6 code (BP) slots and 2 literal slots Info: TPIU fitted. Info: ETM fitted. J-Link>r Reset delay: 0 ms Reset type NORMAL: Resets core & peripherals via SYSRESETREQ & VECTRESET bit. J-Link>h PC = 08001154, CycleCnt = 00000000 R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000 R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000 R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000 R12= 00000000 SP(R13)= 2000A000, MSP= 2000A000, PSP= 00000000, R14(LR) = FFFFFFFF XPSR = 01000000: APSR = nzcvq, EPSR = 01000000, IPSR = 000 (NoException) CFBP = 00000000, CONTROL = 00, FAULTMASK = 00, BASEPRI = 00, PRIMASK = 00 FPU regs: FPU not enabled / not implemented on connected CPU. J-Link>loadbin obj/blankconfig.bin, 0x803f800 Downloading file [obj/blankconfig.bin]... WARNING: CPU is running at low speed (7989 kHz). Info: J-Link: Flash download: Flash programming performed for 1 range (2048 bytes) Info: J-Link: Flash download: Total time needed: 1.254s (Prepare: 0.698s, Compare: 0.009s, Erase: 0.075s, Program: 0.405s, Verify: 0.005s, Restore: 0.059s) O.K. J-Link>r Reset delay: 0 ms Reset type NORMAL: Resets core & peripherals via SYSRESETREQ & VECTRESET bit. J-Link>q ```