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Good Moorning,
I open this post, because i am working in a proyect with Ethernet, but i have a strange issue that i cant find the source of problem. I hope you can help me, Thanks.
The problem, is that in optimization O0 the proyect not work propertly, it occurs a hardfault handler in parte of code that dont have sense. While if i use the optimization Oz, work propertly.
With other levels of optimization, appear same error that O0.
I indicate aditional information of the proyect:
MCU: STM32F779NI ETH_Controller: KSZ9031MNX Library_Ethernet: LWIP ARM Compiler: 6.11
Also, comment that i was modify the Scatter file. I modify it because of i need have reserved RAM (MPU) for the DMA Ethernet.
Thanks for your help.
Kinds Regards.
Thank you very much for you answers.
I was testing some of you suggestions, and i found a piece of the problem. It was related with the memory reserved that free at tcp connections.
After found this error, i have been trying with diferents optimization levels:
- Go on working correctly at Oz -'Seems' working correyly at O1 - Not work O0
Now, at O0 dont work and when fail, it dont give a concrete error, Simply the program stop, and i dont have any information of errors, this appears at a memory position that not have sense and in the table of fails indicate state halted and breakpoint.
I will trying to found why dont work at O0.
If you have any suggestions, i would appreciate it, beacause of the last was good aimed.
Again,thank you very much for you help.
The code will likely only work properly at optimization level -O2 or -O3 -- or another level provided you enable enough optimizations. The optimization levels -O0, -O1, etc., are shorthand for enabling sets of optimizations. See, for example,
gcc.gnu.org/.../Optimize-Options.html
And you can review the ARM compiler reference, too.
-O2 can make code a little harder to follow, due to the re-arranging of operations that the compiler does, but not impossible.