openwrt mtk7628n 如何添加uart2驱动

1、kernel配置 #make kernel_menuconfig         linux 添加/dev/ttyS2设备（原来只有ttyS0, ttyS1）ios Device Drivers  ---> 编程 Character devices  --->ide Serial drivers  --->ui Number of 8250/16550 serial ports to regi

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