Flash Array Integrity Check for MPC5744P

[Mennazz]

Hello, I tried to implement the FAIC for the MPC5744P following the instructions stated in the reference manual, but it ends up with different seeds. I checked your example in the attached link, but I didn't get what every function does as they are not written in C and have no comments, and I can't use it directly as it is implemented on a different compiler, so could you please explain in detail what every function does?

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-MPC5744P-FlashArrayIntegrityCheck-test-S... 

[davidtosenovjan]

Could you provide specific details describing about differences you are mentioning? Have you followed example below?

[Mennazz]

As I mentioned above, your example has been built on the GHS compiler, and I am working on the GCC compiler, so I followed the steps stated in the reference manual.

1. initialising flash (clearing error bits)

2. initialising UTEST mode by writing a password to UT0

3. Setting the appropriate SELn bits (SEL2 = 0x1)

4. Setting the AIS bit for sequential sequence

5. No breakpoints

6. seeding UMn registers with offline-generated MISR

7. Setting the AIE bit to start the check

I tried to follow your example, but all your functions are written in hexadecimal, so I couldn't figure out what they really do.
You can kindly check out my attached project.

[davidtosenovjan]

Flash SSD drivers you may download here, functionality is described in the manual you will find in the installation directory:
https://www.nxp.com/webapp/Download?colCode=C55_NVM_SSD

The driver itself use C-arrays (i.e. binary code) thus it is basically compiler independent.

What you mean you have different seeds? You mean checked value does not fit to stored, correct? It is important to exclude stored checksum from flash area where checksum are being calculated above.

[Mennazz]

Okay, it works, but can I ask you why in the example the endianness is set to little endian while the MPC5744P is big endian?

[davidtosenovjan]

MISR_gen tool uses endianess option:

c:\Program Files (x86)\Freescale\Standard Software Driver v1.1.0\MPC57xx\Tool\MISR_gen\

However SSD package it is not maintained anymore.