[PATCH 22.03] mvebu: cortexa9: disable devices using broken mv88e6176 switch

[Petr Štetiar]

Uwe Kleine-König <uwe+openwrt at kleine-koenig.org> [2022-12-01 12:17:31]:

Hi Uwe,

> On 12/1/22 10:52, Petr Štetiar wrote:
> > Several users have reported, that devices using mv88e6176 switch are
> > seriously broken, basically turning that switch into a hub. Until fixed
> > those devices should be disabled.
> 
> I wonder if disabling is a sane thing to do here. 

IMO it's a serious issue, so we've just following sane options:

 * fix it
 * remove support for those devices and make everyone aware

> People running 22.03.2 won't be able to update

Indeed, bummer, we're sorry about that, but the idea here is to make everyone
aware and prevent more users from upgrading those devices to latest 22.03
release.

> Isn't that worse than a slow network configuration?

Quoting from https://github.com/openwrt/openwrt/issues/10997

 "After upgrade from 21.02 eth switch start to forward all incoming traffic to
  all ports.  I can see ALL traffic using tcpdump on computer connected to one
  port and all eth traffic leds are blinking always simultaneously.  Same
  configuration on 21.02 works ok - VLANs and individual traffic are isolated."

Cheers,

Petr