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charset="UTF-8" Cc: Rob Herring , Linux-ALSA , Timur Tabi , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Shengjiu Wang , Xiubo Li , Liam Girdwood , linux-kernel , Nicolin Chen , Mark Brown , Takashi Iwai , linuxppc-dev@lists.ozlabs.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On Thu, Feb 18, 2021 at 4:21 AM Shengjiu Wang wrote: > > rpmsg is a protocol. What's the h/w block? > > On Linux side this driver is a virtual driver, it is running > on Arm Cortex-A core. The h/w block is controlled by > another core (cortex-M core). so this driver actually > doesn't touch any hardware, it just does configuration > for rpmsg channel. > fsl,version: There are maybe different image running on M core, this > is the image version, different image has different function. To answer Rob's question: the hardware block that handles these messages is the Message Unit block.