S32K144 BusFault while checking CCIF after launching Partition FlexNVM

Joey_van_Hummel — Fri, 11 Dec 2020 13:39:30 GMT

Hi,

I was hoping someone could help me shed light on an issue I'm having.

The problematic code

uint32_t eeIsFlexNvmPartitioned(void) { /* "DEPART field contains 0xF for non-partitioned devices." */ return ((SIM->FCFG1 & SIM_FCFG1_DEPART_MASK) != SIM_FCFG1_DEPART_MASK); } void eePartitionFlexNvm(void) { while ((FTFC->FSTAT & FTFC_FSTAT_CCIF_MASK) != FTFC_FSTAT_CCIF_MASK) { /* Wait for command execution to finish. */ } /* See S32K-RM 36.5.9.1.3 Command execution and error reporting. */ if (FTFC->FSTAT & (FTFC_FSTAT_ACCERR_MASK | FTFC_FSTAT_FPVIOL_MASK)) { FTFC->FSTAT |= FTFC_FSTAT_ACCERR_MASK | FTFC_FSTAT_FPVIOL_MASK; } /* See AN11983 and S32K-RM 36.4.4.1.6.1 */ FTFC->FCCOB[3] = 0x80; /* FCCOB0: Selects the PGMPART command */ FTFC->FCCOB[2] = 0x00; /* FCCOB1: No CSEc operation */ FTFC->FCCOB[1] = 0x00; /* FCCOB2: No CSEc operation */ FTFC->FCCOB[0] = 0x00; /* FCCOB3: FlexRAM loaded with valid EEPROM during reset sequence */ FTFC->FCCOB[7] = 0x02; /* FCCOB4: EEPROM data set size code: EEESIZE = 2 (4 kB) */ FTFC->FCCOB[6] = 0x03; /* FCCOB5: FlexNVM Partition code: DEPART = 3 (Data flash: 32 kB, EEPROM backup: 32 kB) */ /* Execute command. */ FTFC->FSTAT |= FTFC_FSTAT_CCIF_MASK; /* This line causes a busfault. */ while ((FTFC->FSTAT & FTFC_FSTAT_CCIF_MASK) != FTFC_FSTAT_CCIF_MASK) { /* Wait for command execution to finish. */ } }

Application code only calls eePartitionFlexNvm when eeIsFlexNvmPartitioned returns 0. The code is run from bank 0 P-flash. I am operating under the assumption that programming/partitioning bank 1 from bank 0 is OK.

The problem

When the application is run, the last line of code in eePartitionFlexNvm causes the following fault:

BusFault: A bus fault has occurred during instruction prefetching.

This also seems to occur when not debugging. For some reason, debugging and using step-by-step debugging seems to work well.

Other remarks

I have tried setting OCM1 in OCMDR0 and OCMDR1 to 0x3 before the command execution to no avail.
Executing the code from RAM seems to solve the issue, but I was under the impression this would not be necessary, and feels like a work-around rather than a proper fix.

Questions

What is the mechanism behind this fault? I thought programming FlexNVM/D-flash from P-flash should not be a problem.
I saw a similar problem on StackOverflow where the OT suggested "Disabling caching by writing LMEM->PCCRMR = 0;" solved their problem. Is this a valid solution? I haven't specifically enabled caching. I also do not see anything mentioned about this in AN11983 or the sample project flash_partitioning_s32k144.
How can I solve this problem?

Kind regards,

Joey

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

danielmartynek — Mon, 14 Dec 2020 12:48:55 GMT

Hi Joey,

The command must be launched from SRAM or through JTAG/SWD.

A function can be placed in SRAM as it is shown here:

https://community.nxp.com/t5/S32K/Linker-file-configuration-to-allow-code-execution-from-RAM/m-p/803493

Regards,

Daniel

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

Joey_van_Hummel — Mon, 14 Dec 2020 12:30:12 GMT

Hi Daniel,

Thank you once again. I've obviously missed this part of the documentation, sorry for that.

Kind regards,

Joey

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

PradeepAithal — Mon, 22 Feb 2021 09:38:49 GMT

Hi Daniel,

i tried this solution but still problem exist.

Do i need to enable the IRQ also?

without this change(as suggested by your previous comment) at least in debug mode if i do step operation ,i could run the SW after words.

Now with this change control is not coming out or going into of this function even after step operations.

Attached screenshot,

S32K中的主题 Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

S32K144 BusFault while checking CCIF after launching Partition FlexNVM

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM

Re: S32K144 BusFault while checking CCIF after launching Partition FlexNVM