MTK串口调试LOG显示ttyMT1设备无法打开

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我用MTK 自带的serialchat做串口1的测试，log信息中发现设备打不开，有人遇到过吗，如何解决，谢谢。
D/DisplayEventReceiver( 649): rev(0xb8c59120) w/ vsync, t=11223587016344, id=0, c=87177
D/SurfaceFlinger( 150): requestNextVsync(649)
D/SurfaceFlinger( 150): postEvent(649, v/c=87178)
E/SerialServiceJNI( 649): could not open /dev/ttyMT1
W/ActivityManager( 649): Activity pause timeout for ActivityRecord{371cddc0 u0 com.android.serialchat/.SerialChat t11}
I/libPerfService( 649): 1: set: 1
E/libPerfService( 649): Could not open '/sys/devices/system/cpu/cpufreq/hotplug/cpu_num_base'
E/libPerfService( 649): error : 13, Permission denied
I/libPerfService( 649): 1: set freq: 0
E/libPerfService( 649): write file (/proc/cpufreq/cpufreq_cur_freq) fail, count: -1
E/hwcomposer( 150): [SYNC] (0xb80bd740) [PF] (0) fence 218 didn't signal in 1000 ms
I/hwcomposer( 150): [SYNC] (0xb80bd740) timeline fd(-1) curr(0) last(0)
I/hwcomposer( 150): [SYNC] (0xb80bd740) fence(ovl_fence-0-11866) status(0)
I/hwcomposer( 150): [SYNC] (0xb80bd740) sync point: timeline(present_fence_timeline) drv(sw_sync) status(0) sync_drv(11867) timestamp(0.000000)
I/SurfaceFlinger( 150): [Built-in Screen (type:0)] fps:4.970897,dur:1005.85,max:339.23,min:19.86
W/hwcomposer( 150): [WKR] Timed out waiting for UIComposeThread_0...