Linux/AM5728: IPC synchronization

Tony Tang

Part Number: AM5728

Tool/software: Linux

When use IPC, when ARM modified a buffer and pass it to DSP in IPC, who to synchronize Cache to memory in ARM side under Linux?

over 7 years ago

0 Rex Chang over 7 years ago

TI__Guru 50170 points

Hi, Tony,

For AM5728, it is mapped to uncached memory so no action is needed.

Rex

0 Tony Tang over 7 years ago in reply to Rex Chang

TI__Mastermind 29412 points

Thanks Rex,

Where does it configured the memory uncached?

And why mapped it o uncached memory? I think uncached memory will sacrifice performance, if it is cached, back to my question, how to synchronize it, which API?

0 Rex Chang over 7 years ago in reply to Tony Tang

TI__Guru 50170 points

Tony,

The memory is configured through CMA area in dts file.

Using cache memory still has overhead which needs to consider. It could be that when IPC is designed, it didn't see much advantage from using cache memory, but has a simpler design.

Rex

Processors

Processors forum

Linux/AM5728: IPC synchronization