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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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PROGMEM equivalent

Posted by straubm on 2017-07-18 18:55

Hi, in ATMEL’s IDE C compiler, there is an attribute PROGMEM (include pgmspace.h) for placing a const variable in program memory. There are read/write routines/macros, too (pgm_read_....).
Is there anything similar in System Workbench gcc?

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Posted by bugmenot on 2017-07-20 11:31
Just use const, the linker will place it in the read-only .rodata section and the startup code will not copy it into RAM.
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Posted by straubm on 2017-07-22 18:33

Thanks for your answer.

I’m aware of THAT. The background of my questions was: I want to use a portion of flash for factory and/or user settings with read/write capability without manually tinkering around with linker segments atl. Seems to be no way but diggin into it.

I’ll leave it at that.

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Posted by bugmenot on 2017-07-24 11:42

In that case you have 3 options I think:

1. Use a microcontroller with an EEPROM (L0, L1 series) and place the user settings there
2. Use one of the available EEPROM emulation libraries - http://www.st.com/en/embedded-software/stsw-stm32066.htmlQuestion
3. Use your own functions to read/write data into the Flash memory, but be aware of flash wear-leveling problem if you want to save the settings frequently

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