iac exception on stm32mp257f.ev1 using SFRs on CubeIDE to inspect HPDMA3 registers

[MBassi]

Hello,

on a stm32mp257f-ev1 board I'm developing a non secure M33 firmware using hpdma3.

I configured hpdma3 on optee RIF DT to be used only by M33 (CID2) for all channels as follow

&hpdma3 {
	st,protreg = <
		RIFPROT(RIF_HPDMA_CHANNEL(0), RIF_UNUSED, RIF_UNLOCK, RIF_NSEC, RIF_NPRIV, RIF_CID2, RIF_SEM_DIS, RIF_CFEN)
.........................................................................................
.........................................................................................
		RIFPROT(RIF_HPDMA_CHANNEL(15), RIF_UNUSED, RIF_UNLOCK, RIF_NSEC, RIF_NPRIV, RIF_CID2, RIF_SEM_DIS, RIF_CFEN)
	>;
};

When I debug the firmware on CubeIDE if I try to inspect HPDMA3 registers using "SFRs" tab I get on linux console iac exceptions of this type:

E/TC:0   stm32_iac_itr:192 IAC exceptions [159:128]: 0x200000
E/TC:0   stm32_iac_itr:197 IAC exception ID: 149
E/TC:1   stm32_iac_itr:192 IAC exceptions [159:128]: 0x10000000
E/TC:1   stm32_iac_itr:197 IAC exception ID: 156
E/TC:1   stm32_iac_itr:192 IAC exceptions [159:128]: 0x200000
E/TC:1   stm32_iac_itr:197 IAC exception ID: 149

 I think there is something wrong with HPDMA3 RIF configuration, but I cannot understand the whole messages:

- Which's the difference between "E/CT:0" and "E/TC:1"?

- Where I can find the meaning of hex codes at the and of each message?
I tried reading the "How to analyze IAC & SERC errors" guide but I don't found informations on points above.

Last question is: how can I update RIF configuration to avoid these iac excepections?

Regards

Marco.