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am3352,的sysboot【15-0】,电压偏低。系统不能打印信息



sysboot【15-0】,上拉的接100k接vddshv6-3.3v,下拉接10k接地。

测上拉的后io电压在1.9v左右,为什么不是3.3v。每个都是这样。这16个脚还接了lvds芯片。

 

将上拉100k改成30k电压就上去了到2.8v这样,系统启动串口0任然不能打印信息,cccc都不出现