TDA4VM: [6.2.00.21-SDK] About Vision-APP IPC question

Hi Samuel,

lei fu1 said:

1. in dmesg: It shows all firmware are works in IPC-only mode; seems it enables ipc echo test automatically.

 what's the ipc-only mode?

"IPC-only" mode means that the firmware that is using IPC was not loaded by remoteproc.

lei fu1 said:

2. Use my own C71 IPC test firmware replace the one in /lib/firmware/j7-c71_0-fw. and found only 8bytes can be received in C71 via ipc; it there any limitation code/macro in it?

The size of the message that can be sent is up to 512 bytes. Where are you seeing the limitation of 8 bytes in your firmware?

lei fu1 said:

3. is there any loop count setting for the ipc echo test, or it just a infinite test?

You can change the number of echos that are performed between remote cores by modifying the value of NUMMSGS in the example code in examples/common/src/ipc_testsetup.c

If you are referring to the rpmsg_client_sample, you can change the number by specifying the count value while insmoding the sample:

    modprobe rpmsg_client_sample count=5

lei fu1 said:

4. I also tracked HWI No.5 and No.6 in C71 are enabled. what's HWI No5,6 stands for? 

If you are asking what interrupts IPC is using, IPC will register interrupt handlers for interrupts from mailboxes that it uses for IPC communication. This is done using the SYSBIOS HWI module.

Thanks,

Angela