HI Mike,
You're right, you need to have the audio serial interface active for the miniDSPs to start up. In your PCB, WCLK and BCLK need to be floating or large value resistor. The same for DOUT pin. DIN can be ground.
You then need to make BCLK and WCLK as outputs, select BCLK N divider source (e.g. DAC_MOD_CLK) and set the N divider to a proper value.
Also, make sure that the codec's analog supplies are configured properly. If you are using the internal ALDO (similar to AIC3254EVM-U) then you need to power up the ALDO. If that is the case, then set the TargetBoard property of the framework to TLV320AIC3254EVM-U. Modify the SystemSettingsCode property as needed to configure BCLK and WCLK as outputs as well.
Regards,
J-