According to the topic Setting up wifi Access Point on TX1
I was able to set up TX1 as a AP bridge from cable.
But I want to know if there is a possibility to make it as a soft AP since I had to configure the wifi as following:
Add the following line to /etc/modprobe.d/bcmdhd.conf:
options bcmdhd op_mode=2
After I configure the op_mode=2, I was not able to find any wifi signal on TX1.