On 07/20/2018 06:08 AM, Magnus Damm wrote: >>>>>>> From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> >>>>>>> According to the data sheet the Ethernet-AVB hardware in R-Car Gen3 >>>>>>> and R-Car Gen2 SoCs do not support half duplex operation. So update >>>>>>> the driver to mark 100Mbit HDX as unsupported. >>>>>> >>>>>> What about 1000Mbit HDX? >>>>> >>>>> For Twister Pair I believe 10 and 100 Mbps come in HDX and FDX flavors >>>>> while 1 Gbps is HDX-only. >>>> >>>> 1 Gbps is _F_DX-only? >>> >>> No, only higher speeds are FDX only. >>> >>>>> https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair >> >> That wiki page says "However, half-duplex operation for gigabit speed isn't >> supported by any existing hardware.". > > Exactly. Also the PHY data sheet might have some additional > information about bitmaps for advertised and supported modes. Indeed. KSZ9031MNX PHY seems to support 1000Mbit Half-duplex, judging on its datasheet... [...] > Thanks, > > / magnus MBR, Sergei
