How to make working TFTP server on CentOS 6.2

Your /etc/xinet.d/tftp configuration file is correct.

The permissions of /tftpboot should be 755 or drwxr-xr-x.

Make sure chkconfig --list shows tftp enabled under xinetd.

xinetd based services:
        chargen-dgram:  off
        chargen-stream: off
        daytime-dgram:  off
        .
        .
        rsync:          on
        tcpmux-server:  off
        tftp:           on