Hi Sergei,
On Thu, Jul 19, 2018 at 7:56 PM Sergei Shtylyov
<sergei.shtyl...@cogentembedded.com> wrote:
> On 07/19/2018 08:42 PM, Geert Uytterhoeven wrote:
> >>>> From: Magnus Damm <damm+rene...@opensource.se>
> >>>> 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 -- ge...@linux-m68k.org
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
