IPC to trigger wakeup of A53 from STR

[Vishnu3]

Hi,

I am using a S32G274A RDB2 Goldbox.

I have got the following working:

1. STR of A53 and wakeup using RTC.

2. IPC communication between M7 and A53.

I would like to know if I can implement the STR on A53 and use the IPC as a trigger from M7 to wakeup the A53. Is this even possible from the S32G27A architecture's perspective? If yes, some pointers to get this working will be greatly appreciated.

P.S: I am using Linux BSP 42 for A53

Best,

Vishnu

[chenyin_h]

Hello, @Vishnu3 

Thanks for the post.

STR is a high-level concept, implemented by the Linux kernel and the , from BSP's default settings perspective, the m cores would all be turned off by the A53_0, so that by default it could not be supported to be waked from M7 cores.

From my understanding, the M cores could be used to wake up the system,  from my opinion, you may need modify the current STR code in TF-A, remove part of them and then implement them on M7 cores. 

It is a specific use case and currently there is not formal document regarding to this topic,  I apologize for your inconvenience.

BR

Chenyin