The PCBA board we used before works normally. And there is mass production.
But, the pcba produced this time cannot be started normally. The software uses the same one. If we replace the ixm6sl, it will work normally. Compared with imx6sl Part Number, there are the following differences：
MCIMX6L8DVN10AA :can't boot completely.
MCIMX6L8DVN10AB: it works well.
Each problematic board runs to the same log and stops.See the attachment for details.
