如何在Linux中创建一个虚拟io设备，将数据代理到真实设备？

I have an interesting problem. I am working on an embedded box with multiple instances of Linux running each on an ARM processor. They are connected over internal 1GBps network. I have a serial port device node attached to processor A (Lets say Linux-A running on it). I have a program running on processor B (Lets say on Linux-B) access the serial port device as if it is attached to Linux-B locally. I have an interesting problem. I am working on