Hi Geert, On Fri, Jul 20, 2018 at 5:09 AM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > On Thu, Jul 19, 2018 at 7:56 PM Sergei Shtylyov > <sergei.shtylyov@xxxxxxxxxxxxxxxxxx> wrote: >> On 07/19/2018 08:42 PM, Geert Uytterhoeven 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. > Running ethtool on a few systems shows that some of them don't support it, while > others do. Amen. Nice to see that at least someone else is using ethtool to test link configuration. =/ Thanks, / magnus
