Hi Andrew, On Fri, Aug 13, 2021 at 04:45:58PM +0200, Andrew Lunn wrote: > On Thu, Aug 12, 2021 at 08:40:17PM -0700, Tao Ren wrote: > > On Fri, Aug 13, 2021 at 01:29:17AM +0000, Joel Stanley wrote: > > > On Thu, 5 Aug 2021 at 22:28, <rentao.bupt@xxxxxxxxx> wrote: > > > > +&mdio1 { > > > > + status = "okay"; > > > > > > You're enabling this but it looks like it's unused? > > > > Thanks Joel for the careful review. The MDIO controller is not paired > > with BMC MAC; instead, it's connected to the MDC/MDIO interface of the > > on-board switch (whose ports are connected to BMC, Host and front panel > > management port). > > What switch is it? Is there a DSA driver for it? drivers/net/dsa/* > Ideally you want Linux to be controlling the switch, in the standard > linux way. > > Andrew Thanks for jumping in. We are using BCM5389 and the MDIO bus is used to access BCM5389 MDC/MDIO interface in Pseudo-PHY mode. I didn't know drivers/net/dsa, but let me check out the drivers and see if it works in the Cloudripper environment. Thanks, Tao