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AM6548: AM6548 ICSSG Multicast Support - EMac or FDB?

Part Number: AM6548

Hello, 

I was wondering if the ICSS ethernet MACs on the AM6548 SR2.0 support multicast address filtering? In the PDK I see functions for enabling multicast filters on ti/drv/icss_emac/src/icss_emacFwInit.c. I have tried running some of the IOCTL commands, and they do not seem to work (i.e. ICSS_EMAC_IOCTL_MULTICAST_FILTER_CTRL_ENABLE and ICSS_EMAC_IOCTL_MULTICAST_FILTER_CTRL_ADD_MACID). 

So my question is, are these even the right APIs to do this? These APIs are separate from the enet driver, and when I try to look at ICSS firmware versions like with 

ICSS_EmacValidateFeatureSet(icssEmacHandle, portNo, ICSS_EMAC_FW_MULTICAST_FILTER_FEATURE_CTRL)
It seems as though there is no firmware version in the ICSS. I have configured the ICSS peripheral and am using it in dual ethernet mode (using the enet driver), and unicast is working just fine. Is this the right approach? Or should I instead do "FDB Multicast filtering" as described in the PDK docs, which is just briefly mentioned, and I do not have many details on. 
Thanks,
Ben