Re: port-arm/53216: sunxi awge is unreliable at gigabit speed

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Apr 26, 2018 at 11:46:38AM +0200, Manuel Bouyer wrote:
> > Yes, there are two phys in the soc, only one is connected on the cubietruck
> > (AFAIK).
> > 
> > awge0 at fdt1: GMAC
> > awge0: interrupting on GIC irq 117
> > awge0: Ethernet address: 02:0e:03:41:63:14
> > rgephy0 at awge0 phy 0: RTL8169S/8110S/8211 1000BASE-T media interface, rev. 5
> > rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
> > rgephy1 at awge0 phy 1: RTL8169S/8110S/8211 1000BASE-T media interface, rev. 5
> > rgephy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
> 
> Actually I don't think there are 2 PHYs, in the cubietruck schematics, as
> well as the lime2 schematic, and by board inspection, there is only one
> PHY. I think the same PHY is responding on 2 different addresses.
> 
> Also, it looks like the lim2 resision I have and the cubietruck have
> the same 8211 variant.
> 
> I'll have to investigate some more on my side then

Could be some uninitialized register problem.
I tried to apply the no-rx-delay property for my board in sunxi_platform.c,
this made the problem worse (more packet loss with ping, I couldn't
even connect via ssh, link led on the board off but still on on the switch).
rebooting with a known-good kernel didn't get me a working ethernet.
I had to power cycle to get back to the previous working state.

Now to find what appropriate "no-rx-delay" values would work for this
board ...

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--