Hi Sergei, 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.". Running ethtool on a few systems shows that some of them don't support it, while others do. I don't have any higher speed Ethernet cards yet (do you? ;-) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
