Not able to flash stm32h735g_disco - TARGET: stm32h7x.cpu0 - Not halted

[maxstreitberger]

When using the new Zephyr-SDK-0.15.0, I cannot flash the stm32h735g_disco board.

If I build the zephyr/samples/hello_world project for the stm32h735g_disco and try to flash it, I receive this error:

-- west flash: rebuilding
ninja: no work to do.
-- west flash: using runner openocd
-- runners.openocd: Flashing file: /home/max/Desktop/zephyrproject/build/zephyr/zephyr.hex
Open On-Chip Debugger 0.11.0+dev-00724-g42b6471c1 (2022-08-17-18:23)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
none separate

Info : clock speed 1800 kHz
Info : STLINK V3J9M3 (API v3) VID:PID 0483:374E
Info : Target voltage: 3.300602
Error: BUG: can't assert SRST
Info : [stm32h7x.cpu0] Cortex-M7 r1p2 processor detected
Info : [stm32h7x.cpu0] target has 8 breakpoints, 4 watchpoints
Error: read_memory: read at 0x5c001004 with width=32 and count=1 failed
Error executing event examine-end on target stm32h7x.cpu0:
/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg:236: Error: read_memory: failed to read memory
in procedure 'stm32h7x_dbgmcu_mmw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 169
in procedure 'stm32h7x_mmw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 259
in procedure 'stm32h7x_mrw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 241
at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 236
Info : starting gdb server for stm32h7x.cpu0 on 3333
Info : Listening on port 3333 for gdb connections
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0* stm32h7x.cpu0      hla_target little stm32h7x.cpu       reset

Error: read_memory: read at 0x5c001004 with width=32 and count=1 failed
Error executing event examine-end on target stm32h7x.cpu0:
/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg:236: Error: read_memory: failed to read memory
in procedure 'ocd_process_reset' 
in procedure 'ocd_process_reset_inner' called at file "embedded:startup.tcl", line 876
in procedure 'stm32h7x_dbgmcu_mmw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 169
in procedure 'stm32h7x_mmw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 259
in procedure 'stm32h7x_mrw' called at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 241
at file "/home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/stm32h7x.cfg", line 236
Error: timed out while waiting for target halted
TARGET: stm32h7x.cpu0 - Not halted
FATAL ERROR: command exited with status 1: /home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/bin/openocd -s /home/max/Desktop/zephyrproject/zephyr/boards/arm/stm32h735g_disco/support -s /home/max/zephyr-sdk-0.15.0/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts -f /home/max/Desktop/zephyrproject/zephyr/boards/arm/stm32h735g_disco/support/openocd.cfg '-c init' '-c targets' -c 'reset halt' -c 'flash write_image erase /home/max/Desktop/zephyrproject/build/zephyr/zephyr.hex' -c 'reset halt' -c 'verify_image /home/max/Desktop/zephyrproject/build/zephyr/zephyr.hex' -c 'reset run' -c shutdown

I compared the target file stm32h7x.cfg found in ~/zephyr-sdk/sysroots/x86_64-pokysdk-linux/usr/share/openocd/scripts/target/ from the Zephyr-SDK-0.14.2 with the file from the Zephyr-SDK-0.15.0 and saw some changes, which I then reverted one by one until I noticed that the change in line 145 broke the flashing process. After changing the line back to reset_config srst_only srst_nogate, I could flash the stm32h735g_disco board again.

I have also noticed that after applying the change to the stm32h7x.cfg file, I have to flash the nucleo_f429zi board twice before the flash command succeeds. Afterwards, I can flash it as usual until I flash the stm32h735g_disco again.

For clarification:

Flash order	Success?
stm32h735g_disco	✔️
nucleo_f429zi	❌
nucleo_f429zi	✔️
nucleo_f429zi	✔️
stm32h735g_disco	✔️
nucleo_f429zi	❌
nucleo_f429zi	✔️

This problem only occurred after the switch to the new Zephyr-SDK version. In the previous 0.14.2 version, everything worked fine, and I can use the stm32h735g_disco without any issues on macOS, where I do not use the SDK.

To Reproduce
Steps to reproduce the behavior:

1. west build -b stm32h735g_disco -s zephyr/samples/hello_world/ -p always
2. west flash

Impact
annoyance

Environment (please complete the following information):

• OS: Linux
• main branch
• Zephyr SDK 0.15.0

[erwango]

I've contacted STM32 openocd maintainer for this specific issue.

Meanwhile, if this is blocking, I suggest to use stm32cubeprogrammer runner. Reducing criticality to low since there is an alternate solution.

[erwango]

@maxstreitberger I suspect an openocd configuration issue.
Would you mind trying to replicate the configuration provided for nucleo_h743zi.

Regarding nuclo_f429zi, I'll open a dedicated ticket, as I've found the root cause, and I'm not sure it applies to H7

[erwango]

@maxstreitberger Can you try: #50860 ?