Hello, I've spent about 16 hours trying to get the nrf52_boot and blehci image flashed to my board. I'm hoping someone has some insight about my problem.
I have installed all the SEGGER JLink tools and drivers (v6.14c) on both my OSX host and my Ubuntu 16.04 guest. When using JLinkExe, it can connect to the board over USB. I'm using the latest 1.0.0 version of newt. I've followed the instructions to build the nrf52_boot bootloader for my nRF52DK board (PCA10040 v1.1.0) as well as the blehci app. The targets build just fine and I get a boot.elf.bin and a blehci.img. newt load -v nrf52_boot fails whether I do it on Linux or OSX with the following message (I've added newlines to make it more readable): $ newt load -v nrf52_boot Loading bootloader Load command: /workspace/repos/apache-mynewt-core/hw/bsp/nrf52dk/nrf52dk_download.sh /workspace/repos/apache-mynewt-core/hw/bsp/nrf52dk /workspace/bin/targets/nrf52_boot/app/apps/boot/boot load - Error: Downloading /workspace/bin/targets/nrf52_boot/app/apps/boot/boot.elf.bin to 0x0 GNU gdb (7.8-0ubuntu1+6) 7.8 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later < http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-linux-gnu --target=arm-none-eabi". Type "show configuration" for configuration details. For bug reporting instructions, please see: < http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: < http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word". SEGGER J-Link GDB Server V5.12c Command Line Version JLinkARM.dll V5.12c (DLL compiled Apr 21 2016 16:22:40) -----GDB Server start settings----- GDBInit file: none GDB Server Listening port: 3333 SWO raw output listening port: 2332 Terminal I/O port: 2333 Accept remote connection: yes Generate logfile: off Verify download: off Init regs on start: off Silent mode: off Single run mode: on Target connection timeout: 0 ms ------J-Link related settings------ J-Link Host interface: USB J-Link script: none J-Link settings file: none ------Target related settings------ Target device: nRF52 Target interface: SWD Target interface speed: 4000kHz Target endian: little Connecting to J-Link... Connecting to J-Link failed. Connected correctly? GDBServer will be closed... Shutting down... Could not connect to J-Link. Please check power, connection and settings.. gdb_cmds:2: Error in sourced command file: localhost:3333: Connection timed out. (gdb) quit I have tried erasing the device memory using JLinkExe and trying again, I've tried different operating systems (except Windows because I only have a Macbook with a Windows Guest VM and there doesn't appear to be a native Windows newt tool). I've tried loading the images myself using the SEGGER JLink tools but they all expect .hex files and can't read the build output from the newt tool. I'd be happy with any solution that can simply get these images onto my device, because I'd really like to customize the nimBLE controller firmware for a project I'm working on this week.
