AM2434: enabling CP14 on am2434

I found similar thread

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1307736/lp-am243-how-to-program-the-cortex-r5-debug-unit-in-am243/5006360?tisearch=e2e-sitesearch&keymatch=cp14#

without final resoltion.

some more information:
1. Tried mapping of of 0x73D410000 to 0x10000000 with RAT/MPU
2. write 0xC5ACCE55 to 0x10000300

3. write 0xC5ACCE55 to 0x10000FB0

4. 0x10000304 (OSLAR) reads 0, good

5. 0x10000FB4 (LSR) reads 3 , NOT good

, 
final imression that this module is read-only or RAT does not forward write transaction 

is there anone here who is familiar with this area ? 

Hello Rasty,

On AM243x/AM64x devices, the R5F cores run with certain security configurations that prevent direct CP14 access from application software.

When the processor attempts to execute a CP14 instruction (e.g., MRC p14, ...) and access is not permitted, it generates an Undefined Instruction

exception rather than returning data.

You can look at the example below.

C:\ti\mcu_plus_sdk_am64x_11_01_00_17\examples\kernel\dpl\test_undef

I feel that this is due to security restrictions user can't access either from software or Hw side (JTAG).

Regards,

Anil.

Hi Anil
I already understood that it causes exception and alternative path via memory is not working as well.
I need access to debug facilities behind C14, which one of the major perks of ARM architecture. 
How do I relax security configuration ? 

Thanks

Rasty

Hello Rasty,

I feel that this may not be enabled or supported due to security restrictions.

I need to check with other experts and will confirm with you.

Regards,

Anil.