Re: [PATCH v5 0/7] describe RTL8125 PCIe NICs on Rockchip boards (and add DT binding)

[Geert Uytterhoeven]

Hi Ricardo,

On Wed, 23 Sept 2026 at 20:49, Ricardo Pardini <ricardo@xxxxxxxxxxx> wrote:
> On 22/09/2026 11:17, Geert Uytterhoeven wrote:
> > On Thu, 10 Sept 2026 at 22:08, Ricardo Pardini via B4 Relay
> > <devnull+ricardo.pardini.net@xxxxxxxxxx> wrote:
> >> Several Rockchip rk35xx boards carry on-board Realtek RTL8125 2.5GbE
> >> NICs whose PCI function nodes are not described in the DT. Describing
> >> them allows for stable ethernetN aliases (matching the GMAC alias
> >> convention on these boards) and lets U-Boot's fdt_fixup_ethernet()
> >> inject mac-address properties from its ethaddr/ethNaddr env, so MACs
> >> stay stable across boots and U-Boot and kernel MAC match.
> >>
> >> Tested on a NanoPC-T6: /sys/bus/pci/devices/0004:41:00.0/of_node ->
> >> /sys/firmware/devicetree/base/pcie@fe190000/pcie@0,0/ethernet@0,0 and
> >> u-boot correctly adds local-mac-address property there which is
> >> correctly picked up kernel-side:
> >
> > Have you tested this at 2.5Gbps? With which firmware?
> > I am asking because I have problems at 2.5Gbps using the firmware from
> > linux-firmware (on a different platform, though)
> > https://lore.kernel.org/CAMuHMdXPAeHoeaQbM9rXbXukoMbFV+0k28n6sRMw8XF8720WUA@xxxxxxxxxxxxxx
>
> Hi Geert, yes, the RTL8125's on those boards work at 2.5gbps just fine
> (both with and without the fixed-function nodes in this series). They do
> get quite warm at 2.5gbps. I'm using one of those el-cheapo 8-port
> 2.5gbps switches.
>
> Currently:
>
> [    3.254450] r8169 0002:21:00.0 eth0: RTL8125B, 8e:b4:90:97:32:30, XID
> 641, IRQ 124
> ...
> [   10.480872] r8169 0002:21:00.0 end0: Link is Up - 2.5Gbps/Full - flow
> control rx/tx
>
> # sensors r8169_2_2100:00-mdio-0
> r8169_2_2100:00-mdio-0
> Adapter: MDIO adapter
> temp1:        +52.0°C  (high = +120.0°C)
>
> I'm using whatever is in Armbian's armbian-firmware package:
>
> # ethtool -i end0 | grep -i firmware
> firmware-version: rtl8125b-2_0.0.2 07/13/20

Thanks for checking!

Mine is RTL8125D XID 688, i.e. a different variant.

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