insmod ds1339.ko failed

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my platform is IMX6ULL.

I wrote an i2c device driver program called ds1339.c 3 days earlier,and I could find ds1339 under /dev after insmod ds1339.ko,but I couldn't find ds1339 now,it's very strange.

I tried to program the whole system firmware to my development board which has the same core,and I could find ds1339 under /dev after insmod ds1339.ko.

so,what's the cause of this weird thing??

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add:

the firmware downloaded to the two boards are the same one,hasn't any difference.