Hi,
the T68 has exactly the same header J25, and I can confirm it is a serial port which shows the boot messages.
I do not find my old notes unfortunately, so I can not tell you the pin out any more; but I was able to find a 3.3V serial port there, both with RXD and TXD. I did not find out what the other pins are used for.
The port seems to be configured to 115 kbps on my device, and connects to /dev/ttymxc0 on my device.
There is one more /dev/ttymxc port active, which seems to be used for the bluetooth interface in the T68.
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