Sketch Upload to LinkIt ONE Timeout
Disclaimer: I do not have access to one of these devices to test this on.
Section 3.4.1 of LinkIt's developer's guide (which you linked to) seems to indicate that it is necessary to install COM port drivers on OS X before you can communicate with the board. The [txd] report is communication from your computer to the board, so it seems like you are never establishing a connection. The suggestions in the developer's guide are as follows:

If you are using a LinkIt ONE development board on Mac OS X 10.10, then a USB driver is required to enable connectivity with and firmware updates on the LinkIt ONE development board. The OS X 10.10 built-in generic CDC ACM USB driver is not compatible with three ports available on the LinkIt ONE development board. The steps to install a custom driver to enable the BROM port for Firmware Updater are as follows:

Extract the content of the zip file available in LinkIt ONE SDK software’s Driver folder (see 2.3.2, “Installing LinkIt ONE SDK”) named MacOS_USB_COM_Driver_BM_xxx.xx.x.zip.

Run the installation package (BMCDCACM_Driver_v115.05.0.mpkg) and click Next to install it.

Wait until driver installation has finished, then restart your Mac.


BROM USB driver installation is now complete and you have access to the MTK USB Serial ports.