S32Kのトピックprotect Pheripheral with MPU

protect Pheripheral with MPU

Yellen — Wed, 14 Jun 2023 01:44:06 GMT

Hi,

Can MPU protect registers of Pheripherals?

If the answer is yes, which MPU slave port does the pheriheral belong?

Re: protect Pheripheral with MPU

Robin_Shen — Wed, 14 Jun 2023 06:51:14 GMT

Hi Yellen,

Please read Chapter 16 Peripheral Bridge (AIPS-Lite) of S32K1xx MCU Family - Reference Manual

And you can refer to:
How to use s32k144 aips?
aips_demo_s32k118.zip

Best Regards,
Robin
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Re: protect Pheripheral with MPU

Yellen — Wed, 14 Jun 2023 07:25:41 GMT

Hi Robin,

Thanks for your response.

Refer to the Chapter 16, the MPU will not cover peripheral access protection. The pheriherals are protected by AIPS. Right?

But how to understand the MPU register can be protected by MPU as said below?

Re: protect Pheripheral with MPU

Robin_Shen — Thu, 15 Jun 2023 03:38:46 GMT

14.1.2 Crossbar Switch slave assignments The following table identifies the slaves connected to the Crossbar Switch and whether the system MPU protects them.
System MPU does not protect access to peripheral registers, including system MPU's own registers. Protection is built into Peripheral Bridge (AIPS-Lite).

I also can't understand: If the MPU registers are protected by the MPU

Re: protect Pheripheral with MPU

Yellen — Fri, 16 Jun 2023 01:54:50 GMT

Suppose the MPU's register address is included in one region descriptor, will MPU report error if illegal access to MPU's register occured?

Re: protect Pheripheral with MPU

Robin_Shen — Tue, 04 Jul 2023 02:39:51 GMT

I don't think so, but you can test it out.