Constant Data at Fixed Flash Address.

johnsotack9 · ‎2013-02-12

Posted on February 12, 2013 at 22:33

I have a boot loader that resides in the first flash block of an STM32F4 family processor which is 16K begining at 0x08000000. I would like the last four byte of the sector at 0x08003ffc to contain constant data representing a version number.

Any suggestions? I am using Atollic tools which are GCC based. I would prefer a C/C++ solution but could use assembler if necessary. My current knowlege of ARM assembly is fairly limited.

John

Tesla DeLorean · ‎2013-02-12

Posted on February 12, 2013 at 22:52

Any suggestions?

Specify an address, or memory/section in the linker script, and define the ''attributes'' of the variable to direct it's placement.

Google some documentation and examples for GNU linker scripts.

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johnsotack9 · ‎2013-02-13

Posted on February 13, 2013 at 16:40

Thanks. If I make one section just for the version, that should work.

John

johnsotack9 · ‎2013-02-13

Posted on February 13, 2013 at 22:29

I used the interupt vectors as an example for the linker file (to define a section similar to

.isr_vector

) and the startup.s file (to defined data within the section as is done with the vector table). The defined values showed up in the s-record at the expected address.

John