> (gdb) target extended-remote localhost:3333 Remote debugging using > localhost:3333 0x0001ad90 in ?? ()
That address (0x0001ad90) seems to be in the flash region of the micro:bit memory map: https://github.com/lancaster-university/microbit-targets/blob/3667b701a083c6a8b73385b533179b286abc7848/bbc-microbit-classic-gcc-nosd/ld/NRF51822.ld#L5 So, perhaps when you got this, something was executing from flash when gdb connected and put the target into debug halt? The "??" simply means that the debugger couldn't find symbolic debug information for the address in question so couldn't display a function name. None of this necessarily indicates any problem or erroneous behaviour on the part of OpenOCD/gdb debugging. --- ** [tickets:#356] fail to debug a micro:bit v2 application** **Status:** new **Milestone:** 0.11.0 **Created:** Wed Jul 13, 2022 01:04 PM UTC by Matei Barbu **Last Updated:** Wed Jul 20, 2022 02:39 PM UTC **Owner:** nobody Hello, Am i trying to flash&debug the [TockOS](https://github.com/tock/tock/) kenel using OpenOCD on a [micro:bitv2](https://github.com/tock/tock/tree/master/boards/microbit_v2) board, but ran into difficulties. ```bash $ openocd Open On-Chip Debugger 0.11.0-rc2 Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html Error: flash bank name 'nrf52.flash' already exists Error: flash bank name 'nrf52.uicr' already exists -4 Info : Listening on port 6666 for tcl connections Info : Listening on port 4444 for telnet connections Info : Using CMSIS-DAPv2 interface with VID:PID=0x0d28:0x0204, serial=9904360258994e450062900c00000033000000009796990b Info : CMSIS-DAP: SWD Supported Info : CMSIS-DAP: FW Version = 0255 Info : CMSIS-DAP: Serial# = 9904360258994e450062900c00000033000000009796990b Info : CMSIS-DAP: Interface Initialised (SWD) Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1 Info : CMSIS-DAP: Interface ready Info : clock speed 1000 kHz Info : SWD DPIDR 0x2ba01477 Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints Info : starting gdb server for nrf52.cpu on 3333 Info : Listening on port 3333 for gdb connections Info : accepting 'gdb' connection on tcp/3333 Info : nRF52833-xxAA(build code: A0) 512kB Flash, 128kB RAM undefined debug reason 8 - target needs reset Polling target nrf52.cpu failed, trying to reexamine Info : SWD DPIDR 0x2ba01477 Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints Polling target nrf52.cpu failed, trying to reexamine Info : SWD DPIDR 0x2ba01477 Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints Error: nrf52.cpu -- clearing lockup after double fault Polling target nrf52.cpu failed, trying to reexamine Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints Info : dropped 'gdb' connection Info : accepting 'gdb' connection on tcp/3333``` I would ignore the error messages, but `gdb` fails to run correctly: ```Reading symbols from ../../target/thumbv7em-none-eabi/release/microbit_v2.elf... (gdb) target extended-remote localhost:3333 Remote debugging using localhost:3333 0x0001ad90 in ?? ()``` I am running Debian 5.10.127-1 (2022-06-30) x86_64 GNU/Linux natively, with ```$ gdb-multiarch -v GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git``` Am I doing something wrong? I would much appreciate your help! --- Sent from sourceforge.net because openocd-devel@lists.sourceforge.net is subscribed to https://sourceforge.net/p/openocd/tickets/ To unsubscribe from further messages, a project admin can change settings at https://sourceforge.net/p/openocd/admin/tickets/options. Or, if this is a mailing list, you can unsubscribe from the mailing list.
