TZC380 on iMX6Q/7D: AXI ID and AID_WIDTH

[vsiles]

Hi everyone,

I am trying to configure a TZASC (TZC380) in my secure kernel to prevent Linux and some DMA to mess with the secure part of DRAM. In the documentation, the FAIL ID register holds the identifier of the faulty master. The id n = AID_WIDTH-1 bit long, and represent the master AXI ID.

Where can I find the value of AID_WIDTH and a table listing the possible master AXI ID ?

Best regards,

Vincent

[Yuri · Accepted solution]

Hello,

   AXI ID may be found in the i.MX6 D/Q, S/DL RMs in sections “MMDC Profiling”.
No more information, sorry. 

Have a great day,
Yuri

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[vsiles]

Thank you for this information ! I am not sure I understand exactly what the 'x' are for in this table. For example for ARM_S0, we can read 14'b000xxxxxxxx000. Does it mean that the full AXI ID of ARM_S0 is this pattern with 'x's replaced by the master id of ARM_S0 ?

Thank you for your help,

Vincent

[Yuri]

Basically - yes. The 'x' fields may be changed, say, by internal switch fabric.

Regards,

Yuri.

[vsiles]

Fair enough. Thank you for your helpful support !

I'll wait a bit if anyone can help on the AID_WIDTH part before marking the question as 'answered'.

Best regards,

Vincent