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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


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SW4STM32 UART is not working

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Be careful, you program the UART to transmit/receive 8 DATA bits without parity. The wordlength parameter is the number of useful data bits sent and the parity (if required) is after these 8 bits, not included in them.
Note that you said you wanted 7 bits + ODD parity, but programmed the UART to work 8 bits without parity...

So if you program Hyperterminal (or any better terminal emulator like teraterm) with 7 databits PLUS parity, choose ODD parity and be sure all the bytes that you send have an odd number of 1 bits as any byte with incorrect parity will be rejected by the terminal emulator...