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Remote Proc Tunnel Drivers
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RPTUN driver is used for multi-cores' communication.

Supported RPTUN drivers:

- RPMSG File System
- RPMSG domain (remote) sockets
- RPMSG UART Driver
- RPMSG net Driver
- RPMSG Usersock
- RPMSG Sensor Driver
- RPMSG RTC Driver
- RPMSG MTD
- RPMSG Device
- RPMSG Block Driver
- RPMSG IO expander
- RPMSG uinput
- RPMSG clk Driver
- RPMSG syslog
- RPMSG regulator