# How to flash STM32 from iMX8MP using OpenOCD? **URL:** \ **Category:** NXP i.MX8M Plus\ **Tags:** iMX8M-plus\ **Created:** [November 14, 2023, 12:10pm UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759 "2023-11-14T12:10:12Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![pflander](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@pflander](https://community.solid-run.com/u/pflander)\ **Post date:** [November 14, 2023, 12:10pm UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/1 "2023-11-14T12:10:12Z")
I am using Hummingboard Pulse evaluation board + IMX8MP SOM with Yocto Kirkstone. I need to flash stm32 mcu from iMX8MP. I am using custom yocto image with openocd already installed. Here is my openocd.cfg file: ```auto source [find interface/imx-native.cfg] transport select swd set CHIPNAME stm32f103c8 source [find target/stm32f1x.cfg] # did not yet manage to make a working setup using srst #reset_config srst_only reset_config srst_nogate adapter srst delay 100 adapter srst pulse_width 100 init targets reset halt program firmware.elf verify reset shutdown ``` After running command openocd, I get the following error: ```auto root@lite-unit-openocd:~/openocd# openocd Open On-Chip Debugger 0.11.0 (2023-11-09-16:23) Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html Info : imx_gpio GPIO JTAG/SWD bitbang driver Info : imx_gpio mmap: pagesize: 4096, regionsize: 131072 Bus error ``` Mcu is currently connected to pins on connector J9 : 55 - SWCLK1 and 59 - SWDIO1. From SOM schematic I can see that pin 59 is not connected to J9 connector. ![image](https://europe1.discourse-cdn.com/flex005/uploads/solid_run/original/1X/0e276461746c72bbf365f1b591725c6b8e214846.png) My questions are: - which pins of the SOM can be used for swd? - which pin names to use in imx-native.cfg file? imx-native.cfg file: ```auto # SPDX-License-Identifier: GPL-2.0-or-later # # Config for using NXP IMX CPU # # This is best used with a fast enough buffer but also # is suitable for direct connection if the target voltage # matches to host voltage and the cable is short enough. # # adapter driver imx_gpio # For most IMX processors 0x0209c000 imx_gpio_peripheral_base 0x0209c000 # Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET # These depend on system clock, calibrated for IMX6UL@528MHz # imx_gpio_speed SPEED_COEFF SPEED_OFFSET imx_gpio_speed_coeffs 50000 50 # Each of the JTAG lines need a gpio number set: tck tms tdi tdo. # Example configuration: # imx_gpio_jtag_nums 6 7 8 9 # SWD interface pins: swclk swdio # Example configuration: imx_gpio_swd_nums 1 6 # imx_gpio_trst_num 10 # reset_config trst_only # imx_gpio_srst_num 11 # reset_config srst_only srst_push_pull # or if you have both connected, # reset_config trst_and_srst srst_push_pull ``` ---
**Author:** ![jnettlet](https://dub1.discourse-cdn.com/flex005/user_avatar/community.solid-run.com/jnettlet/32/62_2.png) [@jnettlet](https://community.solid-run.com/u/jnettlet)\ **Post date:** [November 14, 2023, 12:53pm UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/2 "2023-11-14T12:53:33Z")
Are you using openocd from our repository that is patched to work with the iMX8 SOCs? [GitHub - SolidRun/openocd: SolidRun's OpenOCD Mirror](https://github.com/SolidRun/openocd) However this was originally tested with the iMX8MQ SOCs, I would have to verify if it is also correct for the iMX8MP ---
**Author:** ![pflander](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@pflander](https://community.solid-run.com/u/pflander)\ **Post date:** [November 14, 2023, 3:24pm UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/3 "2023-11-14T15:24:33Z")
Build fails at make. I do: > git clone [https://github.com/SolidRun/openocd](https://github.com/SolidRun/openocd) > cd openocd > ./bootstrap > ./configure --enable-imx\_gpio > make Error log: ```auto In file included from ./src/flash/common.h:21, from src/flash/nor/core.h:25, from src/flash/nor/imp.h:22, from src/flash/nor/jtagspi.c:22: src/flash/nor/jtagspi.c: In function 'jtagspi_write_enable': ./src/helper/log.h:130:9: error: 'status' may be used uninitialized in this function [-Werror=maybe-uninitialized] 130 | log_printf_lf(LOG_LVL_ERROR, __FILE__ , __LINE__ , __func__ , expr) | ^ ~~~~~~~~~~~~ src/flash/nor/jtagspi.c:262:18: note: 'status' was declared here 262 | uint32_t status; | ^ ~~~~~ src/flash/nor/jtagspi.c: In function 'jtagspi_wait': src/flash/nor/jtagspi.c:249:29: error: 'status' may be used uninitialized in this function [-Werror=maybe-uninitialized] 249 | if ((status & SPIFLASH_BSY_BIT) == 0) { | ~~~~~~~~^~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors make[2]: *** [Makefile:3312: src/flash/nor/jtagspi.lo] Error 1 make[2]: Leaving directory '/home/root/test/openocd' make[1]: *** [Makefile:4223: all-recursive] Error 1 make[1]: Leaving directory '/home/root/test/openocd' make: *** [Makefile:1981: all] Error 2 ``` ---
**Author:** ![jnettlet](https://dub1.discourse-cdn.com/flex005/user_avatar/community.solid-run.com/jnettlet/32/62_2.png) [@jnettlet](https://community.solid-run.com/u/jnettlet)\ **Post date:** [November 14, 2023, 3:29pm UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/4 "2023-11-14T15:29:14Z")
> [@pflander](#): > > `Werror=maybe-uninitialized` It most likely needs a patch for the newer gcc version that has turned those warnings into errors. Just add “-Wmaybe-uninitialized” to your CFLAGS variable. ---
**Author:** ![pflander](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@pflander](https://community.solid-run.com/u/pflander)\ **Post date:** [November 15, 2023, 8:41am UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/5 "2023-11-15T08:41:29Z")
Thanks for your quick response. Where do I find CFLAGS variable? I found it in make file and appended > Werror=maybe-uninitialized to it. ```auto CFLAGS = -g -O2 -Werror=maybe-uninitialized ``` Command make still produces the same error. ---
**Author:** ![kselyunin](https://avatars.discourse-cdn.com/v4/letter/k/a8b319/32.png) [@kselyunin](https://community.solid-run.com/u/kselyunin)\ **Post date:** [November 15, 2023, 9:49am UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/6 "2023-11-15T09:49:38Z")
[pflander](https://community.solid-run.com/u/pflander) to compile, disable treating warnings as errors (`-Werror`) with the `--disable-werror` configure option: ```auto ./configure --enable-imx_gpio --disable-werror ``` ---
**Author:** ![pflander](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@pflander](https://community.solid-run.com/u/pflander)\ **Post date:** [November 15, 2023, 10:10am UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/7 "2023-11-15T10:10:34Z")
Thanks. Compile process goes further, but still finishes with an error: ```auto /usr/lib/gcc/aarch64-poky-linux/11.3.0/../../../../aarch64-poky-linux/bin/ld: src/.libs/libopenocd.a(libocdjtagdrivers_la-bitbang.o):/home/root/test/openocd/src/jtag/drivers/bitbang.h:60: multiple definition of `bitbang_swd'; src/.libs/libopenocd.a(libocdjtagdrivers_la-imx_gpio.o):/home/root/test/openocd/src/jtag/drivers/bitbang.h:60: first defined here collect2: error: ld returned 1 exit status make[2]: *** [Makefile:2939: src/openocd] Error 1 make[2]: Leaving directory '/home/root/test/openocd' make[1]: *** [Makefile:4223: all-recursive] Error 1 make[1]: Leaving directory '/home/root/test/openocd' make: *** [Makefile:1981: all] Error 2 ``` ---
**Author:** ![kselyunin](https://avatars.discourse-cdn.com/v4/letter/k/a8b319/32.png) [@kselyunin](https://community.solid-run.com/u/kselyunin)\ **Post date:** [November 15, 2023, 10:19am UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/8 "2023-11-15T10:19:41Z")
Did you run configure command without cleaning the previous build results? Can you try: ```auto git clean -xxdf ``` ```auto ./bootstrap ``` ```auto ./configure --enable-imx_gpio --disable-werror ``` ```auto make -j$(nproc --all) ``` It seems you get a linker error because of some previous build artifacts. For me it builds with the instructions above. ---
**Author:** ![pflander](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@pflander](https://community.solid-run.com/u/pflander)\ **Post date:** [December 7, 2023, 11:01am UTC](https://community.solid-run.com/t/how-to-flash-stm32-from-imx8mp-using-openocd/759/9 "2023-12-07T11:01:03Z")
Here the working solution: Yocto recipe: ```auto DEPENDS += "libgpiod" EXTRA_OECONF = "--enable-linuxgpiod --enable-imx_gpio --enable-sysfsgpio --disable-stlink --disable-ti-icdi --disable-ulink --disable-usb-blaster-2 --disable-vsllink --disable-xds110 --disable-osbdm --disable-opendous --disable-aice --disable-usbprog --disable-rlink --disable-armjtagew --disable-cmsis-dap --disable-kitprog --disable-usb-blaster --disable-presto --disable-openjtag --disable-jlink --disable-werror" SRC_URI += " \ file://0001-Port-SolidRun-openocd-patch-ea85b35.patch \ file://0002-SolidRun-Add-Documentation-for-Building-OpenOCD.patch \ " FILESEXTRAPATHS:prepend := "${THISDIR}/files:" ``` Openocd.cfg ```auto adapter driver linuxgpiod linuxgpiod_gpiochip 2 linuxgpiod_swd_nums 20 23 transport select swd set CHIPNAME stm32l412 source [find target/stm32l4x.cfg] reset_config srst_nogate adapter srst delay 100 adapter srst pulse_width 100 init targets reset halt program firmware.elf verify reset shutdown ```