Hello,
On the EVAL-ADAU1701 (and Elektor board) the SELFBOOT pin is connected to 3.3V. According to the ADAU1701 datasheet, I think the SELFBOOT must be low to put the ADAU1701 into SPI mode (by toggling the CLATCH/WP pin three times after reset) So, the board would require modification to use SPI mode.