arduino sketch does not work in branch thud

[xlla]

I am use arduino library, 1.6.7+1.0

after compile and upload sketch, it was running but not work as expect.

should I upgrade sysroot in packages/Intel/hardware/i686/1.6.7+1.0, and patch some file to work with chardev ?

since there are tons of arduino libraries, if we can still support arduino framework, then everything is easy.