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This flag is analogous to the Linux driver FEC_QUIRK_HAS_AVB. It indicates an FEC with support for Audio Video Bridging (AVB). This indicator is used for various other parts in the Linux driver (drivers/net/ethernet/freescale/fec_main.c). Use it to customize the receive/transmit buffer alignment. The receive buffer alignment increased to 64-bytes on the i.MX 6SoloX and i.MX 7Dual. There are no hard alignment restrictions for transmit buffers on these chips. Fix the ffec_softc::fectype type to provide enough storage for the feature flags.