topic Re: Locked flash memory after unhandled IVOR1 exception in MPC5xxx

Locked flash memory after unhandled IVOR1 exception

monahussein — Mon, 16 May 2016 14:14:37 GMT

I was trying to make a 2 bit ECC error on MPC7544P, the 1st time I executed the code IVOR1 exception was detected but I wasn't implementing the handler after that whenever I re-execute the code I find that I am not able to unlock flash blocks. Any explanation?

Re: Locked flash memory after unhandled IVOR1 exception

jasoncao — Mon, 16 May 2016 15:12:55 GMT

Hi,

Do you mean that you try to dowload s19/elf failed through the trace32 ? I think that you just need to clear the Register:

C55FMC_MCR BIT:EHV,PGM by use trace32. If it isn't work,You could try to clear the FCCU NCF Register and Memu Error Flag Register.

Re: Locked flash memory after unhandled IVOR1 exception

monahussein — Tue, 17 May 2016 07:11:15 GMT

Hi Jason,

Thanks for your reply. I can connect using JTAG but when I debug the code below nothing happens and the flash blocks remain locked

C55FMC.LOCK0.R = 0; // remain 0x3FF0FFFC

C55FMC.LOCK1.R = 0; // remain 0x0000FFC0

C55FMC.LOCK2.R = 0; // remain 0xFFFFFF00

C55FMC.LOCK3.R = 0; // remain 0x0000FFFF

/*Hence the following code is not executed */

C55FMC.MCR.B.ERS = 1;

C55FMC.SEL2.R = 0x00000080; // select the large block 7

*(uint32*)0x011C0000 = 0xFFFFFFFF; //interlock write

C55FMC.MCR.B.EHV = 1;

while(C55FMC.MCR.B.DONE == 0);

C55FMC.MCR.B.EHV = 0;

C55FMC.MCR.B.ERS = 0;

C55FMC.MCR.B.PGM = 1;

*(uint32*)0x011C0000 = 0x12345678; //interlock write

*(uint32*)0x011C0004 = 0xAFDBCA42;

C55FMC.MCR.B.EHV = 1;

while(C55FMC.MCR.B.DONE == 0);

C55FMC.MCR.B.EHV = 0;

C55FMC.MCR.B.PGM = 0;

C55FMC.MCR.B.PGM = 1;

*(uint32*)0x011C0000 = 0xABCDEF12; //interlock write

*(uint32*)0x011C0004 = 0xECDFBAD3;

C55FMC.MCR.B.EHV = 1;

while(C55FMC.MCR.B.DONE == 0);

C55FMC.MCR.B.EHV = 0;

C55FMC.MCR.B.PGM = 0;

test_read = *(uint64*)0x011C0000;

Re: Locked flash memory after unhandled IVOR1 exception

davidtosenovjan — Tue, 17 May 2016 11:21:13 GMT

I would agree it is needed to handle FCCU and MEMU faults.

Pay attention to following example code:

Example MPC5744P_1b+2b_FLASH_ECC_error_injection GHS614