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关于AM335X watchdog配置的问题

Other Parts Discussed in Thread: AM3352

大家好,我的板子是AM3352,SDK版本是ti-processor-sdk-linux-am335x-evm-03.02.00.05,我使用busybox-1.26.2自己做了一个最基本的文件系统,启动后发现/dev/目录没有watchdog设备节点,但是如果我同样的内核、dtb文件使用SDK包自带的arago-base-tisdk-image-am335x-evm.tar的话加载后在dev下有watchdog和watchdog0两个设备节点,是busybox需要做什么配置么?

busybox在make menuconfig的时候已经选上了watchdog!