topic Re: MPC5744P FCCU RCCU Fault Injection in MPC5xxx

MPC5744P FCCU RCCU Fault Injection

pederrogo — Tue, 02 Jan 2018 10:09:54 GMT

Hello,

We are using the FCCU NCFF register in MPC5744P to test some FCCU fault handling, for example we test the lock step fault handling by using

FCCU.NCFF.R = va_SUP_FCCU_FaultInjection;

and setting va_SUP_FCCU_FaultInjection to the values 11, 12 and 13.

For values 11 and 12 the behavior is as expected, i.e. theres is a long reset performed. But, for value 13 there seems not to be any reaction.

Thus, is there any difference between the RCCU_0a/RCCU_0b and RCCU_1 faults that could explain this behavior?

We do the following initializations for these faults:

FCCU.NCF_E[0].B.NCFE11 = 0x1u; //Enable reaction on fault NCF[11] - RCCU_0a: Interface (other than D-MEM or DMA) out of lockstep
FCCU.NCF_E[0].B.NCFE12 = 0x1u; //Enable reaction on fault NCF[12] - RCCU_0b: D-MEM array interface out of lockstep
FCCU.NCF_E[0].B.NCFE13 = 0x1u; //Enable reaction on fault NCF[13] - RCCU_1: DMA array interface out of lockstep

/* Configure lock step faults reaction to long reset */
FCCU.NCFS_CFG[0].R |= 0x0A800000u;

Best Regards,

Peder Rogö

Re: MPC5744P FCCU RCCU Fault Injection

petervlna — Wed, 03 Jan 2018 14:05:39 GMT

Hi,

I just made test example for NCF[13] with long reset reaction.

I is working as expected.

I can inject fault and then device is reset. After reset I can see that FCCU triggered long reset was triggered.

See pictures below:

Have in mind that this fault injection must be executed without debugger. As debug mode disable RCCU checkers.

I have also attached for reference my test example.

Peter

Re: MPC5744P FCCU RCCU Fault Injection

pederrogo — Mon, 08 Jan 2018 16:18:57 GMT

Hello Peter,

Thanks for your support.

I guess our problem is due to that we configure FCCU using bitwise operations like

FCCU.NCF_E[0].B.NCFE11 = 0x1u;

We have now changed so that 32-bit operations are used like for example

FCCU.NCF_E[0].R = 0x00003800u;

Now, it seems as FCCU is configured as we would like it to, and a long reset is generated for the FCCU faults that are configured with action set to long reset, including RCCU_1.

Best Regards,

Peder