Hi,
Below will be some comments for the asked questions:
Query 1: Would the loopback message interrupt the processor?
Given the general idea of the loopback mode is to connect the TX to the RX, we would expect that it should set the interrupt flag on the LLCE module.
Query 2: What is the impact if both A53 and M7 access the same Channel?
As for LLCE, there should be none (aside from one processor losing the message). The HOSTs (A53 or M7 cores) do not access directly the LLCE resources. LLCE manages its own resources and tells the respective HOST that a message is available under a certain shared memory. If for some reason 2 HOSTs have the same resource mapped to them, we would expect that the first HOST to attend the IRQ will take the request and the other HOST will not attend it. Given that the IRQ should have to be cleared once it is attended, only the HOST that access it will go and look into the message.
Query 3: Difference between loopback and self–receive.
The loopback mode ignores the RX pin from external messages (shown below) and self-receive is mainly for debug reasons (shown below).
Query4: Is there a possibility to only do self-receive and not loopback?
We do not see any restriction that requires both to be enabled at the same time, unless we are misunderstanding your query.
Please, let us know if this information was helpful or not.
