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How does AM3359 decide to use the interface of RMII1 or interface of RMII2?

Other Parts Discussed in Thread: AM3359

Recently,I use the AM3359 and PHY LAN8710A .

The PHY_AD pins connect to the ground through 10K resistor.

I set the GMII_SEL 0xc5 to support the rmii2 interface

I'm confused that how  AM3359 decide to use the interface of RMII1 or interface of RMII2 in SDK06.00.00.00 linux kernel.