YTM32B1MD14 - MPU Configuration - Can I grant permission rw-|r-- for a memory section?

[nguyan2]

Hello all,

For one memory section, I want to grant read-write access for privileged mode and read-only access for unprivileged mode (rw-|r--).

However, I don’t see any permission option like this in the source code generated by the YTConfig Tool.

I also checked the ARMv8-M documentation, and it seems that this kind of permission is not directly supported.

Is there any known solution or workaround for this case?

Thanks in advance!

[Diga]

ARMv8 can't support your case.
If set AP = 0b00, only privaleged code can read/write memory, user mode can't read or write;
If set AP = 0b01, any privaleged code can read/write memory, user mode also;

[nguyan2]

Diga 在 YTM32B1MD14 - MPU Configuration - Can I grant permission rw-|r-- for a memory section? 中说：

ARMv8 can't support your case.
If set AP = 0b00, only privaleged code can read/write memory, user mode can't read or write;
If set AP = 0b01, any privaleged code can read/write memory, user mode also;

Hi, thanks for your reply. Do you have any idea about the workaround for my case?

[Diga]

ARMv7 can support your case. YTM32B1HA01's core is CORTEX-M7 with ARMv7.

[nguyan2]

Diga 在 YTM32B1MD14 - MPU Configuration - Can I grant permission rw-|r-- for a memory section? 中说：

ARMv7 can support your case. YTM32B1HA01's core is CORTEX-M7 with ARMv7.

Thanks for your suggestion but unfortunately we can't change the chipset.

Is there any mechanism or any demo code to switch between Supervisor mode and User mode for YTM32B1MD14?