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I cannot be the root in my filesystem (am3517)

Hi everyone,

I have TAM3517 board and i installed angstrom linux on it. i create my own file system with buildroot.

But in the startup there is a login screen asking my username. Somehow i typed "default" and was able to login

but i cannot get my work done with this user, because it is not root ! when i type "sudo" it gaves this error

"default is not in the sudoers file. This incident will be reported"

So, is there a way to set a root user from build root ? or how can i solve this problem ?

Thanks in advance,