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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


communication error coming when I am connecting my board -> stm32f446re

open stm32 software is showing the following error. before it my program was working fine
I have imported project created on stm32cubemx on open stm32 software by selecting the sw4stm32 option in toolchainIDE



Open On-Chip Debugger 0.10.0+dev-00021-g524e8c8 (2019-04-12-08:48)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
srst_only separate srst_nogate srst_open_drain connect_assert_srst
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
adapter speed: 8000 kHz
adapter_nsrst_delay: 100
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 8000 kHz
Info : STLINK v2.1 JTAG v37 API v2 M26 VID 0x0483 PID 0x374B
Info : using stlink api v2
Info : Target voltage: 3.246506
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Stlink adapter speed set to 4000 kHz
Info : STM32F446RETx.cpu: hardware has 6 breakpoints, 4 watchpoints
Info : Listening on port 3333 for gdb connections
Info : accepting ‘gdb’ connection on tcp/3333
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08001560 msp: 0x20020000
configuring PLL
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Stlink adapter speed set to 4000 kHz
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
adapter speed: 4000 kHz
Info : device id = 0x10006421
Info : flash size = 512kbytes
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x20000046 msp: 0x20020000
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08001560 msp: 0x20020000
Error: jtag status contains invalid mode value - communication failure
Warn : target STM32F446RETx.cpu is not halted (gdb fileio)
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 100ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 700ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 1500ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 3100ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
Polling target STM32F446RETx.cpu failed, trying to reexamine
Examination failed, GDB will be halted. Polling again in 6300ms