# nRF52810 & Raspi - Failed to erase reg: 0x4001e50c val: 0x00000001 **URL:** \ **Category:** MicroMod\ **Tags:** arm-lpc\ **Created:** [July 29, 2018, 11:17am UTC](https://community.sparkfun.com/t/nrf52810-raspi-failed-to-erase-reg-0x4001e50c-val-0x00000001/35720 "2018-07-29T11:17:06Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![kaefert](https://avatars.discourse-cdn.com/v4/letter/k/8797f3/32.png) [@kaefert](https://community.sparkfun.com/u/kaefert)\ **Post date:** [July 29, 2018, 11:17am UTC](https://community.sparkfun.com/t/nrf52810-raspi-failed-to-erase-reg-0x4001e50c-val-0x00000001/35720/1 "2018-07-29T11:17:06Z")
I would like to flash an nRF52810 board by using OpenOCD running on an Raspberry Pi 1 B Rev2. I built and installed OpenOCD on my Pi like so: ```auto git clone https://git.code.sf.net/p/openocd/code openocd-code cd openocd-code ./bootstrap ./configure --enable-sysfsgpio --enable-bcm2835gpio make sudo make install ``` Between checking out and building I’ve modified nrf5.c to include this line: NRF5\_DEVICE\_DEF(0x0139, “52832”, “QFAA”, “E0”, 512), I’ve connected these nRF52810 Pins to those Pi Pins: ```auto SWDIO <-> GPIO24 SWDCLK <-> GPIO25 P021=RST <-> GPIO18 ``` I’m using this openocd.cfg file: ```auto source [find interface/raspberrypi-native.cfg] bcm2835gpio_speed_coeffs 113714 28 bcm2835gpio_swd_nums 25 24 bcm2835gpio_srst_num 18 reset_config srst_only srst_push_pull transport select swd set WORKAREASIZE 0 set CHIPNAME nrf52810 source [find target/nrf51.cfg] reset_config srst_only srst_nogate adapter_nsrst_delay 100 adapter_nsrst_assert_width 100 init targets halt nrf5 mass_erase flash write_image feather52_bootloader_v050_s132_v201.hex 0 reset halt targets verify_image feather52_bootloader_v050_s132_v201.hex 0 reset run targets exit ``` And I’m getting this output: ```auto Info : BCM2835 GPIO JTAG/SWD bitbang driver Info : JTAG and SWD modes enabled Info : clock speed 1006 kHz Info : SWD DPIDR 0x01a93070 Info : SWD DPIDR 0x2ba01477 Info : nrf52810.cpu: hardware has 6 breakpoints, 4 watchpoints Error: nrf52810.cpu -- clearing lockup after double fault Polling target nrf52810.cpu failed, trying to reexamine Info : nrf52810.cpu: hardware has 6 breakpoints, 4 watchpoints Info : Listening on port 3333 for gdb connections TargetName Type Endian TapName State -- ------------------ ---------- ------ ------------------ ------------ 0* nrf52810.cpu cortex_m little nrf52810.cpu halted Info : nRF52810-QFAA(build code: Bx0) 192kB Flash Error: Failed to erase reg: 0x4001e50c val: 0x00000001 Error: Failed to erase the chip ``` Trying to flash without the mass erase gives this output: ```auto Info : nRF52810-QFAA(build code: Bx0) 192kB Flash Info : Padding image section 0 at 0x00000964 with 1692 bytes Warn : not enough working area available(requested 32) Warn : no working area available, falling back to slow memory writes Warn : no flash bank found for address 0x00074000 Warn : not enough working area available(requested 36) Running slow fallback erase check - add working memory Warn : not enough working area available(requested 32) Warn : no working area available, falling back to slow memory writes wrote 112336 bytes from file feather52_bootloader_v050_s132_v201.hex in 11.031472s (9.945 KiB/s) target halted due to debug-request, current mode: Handler HardFault xPSR: 0x01000003 pc: 0xfffffffe msp: 0xffffffd8 TargetName Type Endian TapName State -- ------------------ ---------- ------ ------------------ ------------ 0* nrf52810.cpu cortex_m little nrf52810.cpu halted Warn : not enough working area available(requested 52) Warn : not enough working area available(requested 52) Warn : not enough working area available(requested 52) Error: checksum mismatch - attempting binary compare diff 0 address 0x00074000. Was 0x00 instead of 0x80 diff 1 address 0x00074001. Was 0x00 instead of 0x7f ... diff 127 address 0x000740c5. Was 0x00 instead of 0x94 More than 128 errors, the rest are not printed. ``` Can you help me? On the [[nordicsemi forum](https://devzone.nordicsemi.com/f/nordic-q-a/36813/openocd-nrf52810-can-t-erase-or-flash---unknown-device-hwid-0x00000142) an engineer told me OpenOCD only supports the nRF52832 chip and not the nRF52810 and I need to use an SEGGER debugger instead. But I figured those two chips are almost the same and adding support shouldn’t involve too much of a hassle. Can you tell me what needs to be done? On the same forum there is a post that reads like other people have already figured it out: [https://devzone.nordicsemi.com/f/nordic … spberry-pi](https://devzone.nordicsemi.com/f/nordic-q-a/33140/programming-nrf52810-with-openocd-and-raspberry-pi)]([OpenOCD nRF52810: Can't erase or flash - Unknown device HWID 0x00000142 - Nordic Q&A - Nordic DevZone - Nordic DevZone](https://devzone.nordicsemi.com/f/nordic-q-a/36813/openocd-nrf52810-can-t-erase-or-flash---unknown-device-hwid-0x00000142))