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RZ/N1: can we connect both GMAC to the switch

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Hi there,

My goal is to have a single Ethernet port that is connected to both GMAC of RZ/N1D: GMAC1 being run by Linux on dual A7 and HW-RTOS GMAC managed by M3. Alternatively, we may also want to dedicate GMAC1 to one A7 core and GMAC2 to the second A7 core.

To achieve that, I would like to connect GMAC1/GMII1 directly to GMII2, assuming that GMII protocol is symmetrical. That way I can use another port (eg. GMII5), let the switch forward packet either to upstream port (HW-RTOS) or to GMII2 (and hence toward GMAC1).

My question is about the assumption that two GMII port can be connected together face to face (only shorting external pins appropriately), crossing TX and RX. Is this likely to work ?

Thanks.


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