hi all, I am using stm32f407 development board and Kiel for debugging some of the lines can't able to put a breakpoint can anyone please help me to crack this.

[MK S.1]

some of the lines in debugging mode in the left column are highlighted in that lines only I can able to put a breakpoint.

I assigned some instruction in non highlighted lines as well in that line  can't able to put a breakpoint.

[Tesla DeLorean]

There is no code behind the line, either removed or folded by optimizer, of dead code removal by linker.

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Code may translate to zero or many lines of assembler, this code may ​be folded or reordered.

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Try turning off the optimization globally or at function level. Check .MAP to confirm routines present, review listing files.​