As discussed in this post https://community.nxp.com/t5/S32K/S32K312-HardFault-issue-while-quot-sector-erase-quot/m-p/1465331#M... I have copied the functions in ITCM this way
But after this I was still getting hard-faults on flash erase operation sometimes. What makes it hard to debug is that sometimes it erases successfully but sometimes it ends up in hardfault, specifically in the
Another point to consider is that in my Mem_43_InFls_MemMap.h file MEM_43_INFLS_START_SEC_CODE macro was defined. in the header file we see that there is a compiler directive #pragma arm section code=".mcal_text". I'm copying the c40 drivers in ITCM but since I havent changed this macro could this be causing a problem? If yes then why does this not lead to hard fault every time and only happens intermittently on some erase operations.
Once in the hardfault handler, the LR has an address of 0xffffffe9 which is some invalid address.
Later, I came across this post https://community.nxp.com/t5/S32K/ramcode-section-not-used-when-optimization-level-lt-O2/m-p/1834242 where the contributor has mentioned that #define MEM_43_INFLS_START_SEC_CODE needs to be replaced with #define MEM_43_INFLS_START_SEC_RAMCODE and similarly for STOP. And inside the Mem_43_InFls_MemMap.h file I have replaced the #pragma directive from ".ramcode" to ".itcm_text" since I am copying the C40 functions into the ITCM.
When I do this I no longer get hardfaults and the flash erase operation works fine.
