Currently default pinmux is one ethernet port + sdcard + i2s + i2c + refclk + many gpio.
Actually there is a hidden pinmux in mt7628 chip, we can use ethernet x 5 + sdcard without i2c/i2s.
Very interesting, this pinmux works well on VoCore2 but do not have any clue in datasheet.
We need to remove i2c pull up resistor to make it work normal.
Its pin order:
but also need to update driver to make it work. 🙂