On Wed, Mar 17, 2021 at 10:30 AM Alexander Dahl <ada@thorsis.com> wrote:

> Hello,
>
> for testing some new mikroBUS modules I got a dusty SAMA5D2-SOM1-EK1 from
> our
> shelf and build recent DistroKit master for it. Nice thing: SD card works
> in
> both ports. However ethernet does not work correctly out of the box. :-/
>
> In barebox shell it uses a random mac address (the real one is in a small
> eeprom on the SoM), dhcp and ping successful.
>
> In Linux (5.11.4) however it also uses a random mac address and
> furthermore
> either the micrel ethernet phy is not found at all or the link can not be
> set
> to up. Tried both nmtui and raw iproute2 command.
>

Hey Alexander,

I don't know if this will apply to you with sama5d2-som1-ek1, but we have a
board that is based on sama5d2-som1 that has ksz8081rna phy, which based on
the strap on options configured via pull up/down is on phy 4.
We are in the process of updating from linux-4.14 to linux-5.4. A problem
that was noticed on update to linux-5.4 was that the Ethernet port stopped
working after power on boot, but would work after a subsequent soft reboot.
I noticed that the phy address used in
arch/arm/boot/dts/at91-sama5d27_som1.dtsi didn't match the one for our
board in either the linux-4.14 or linux-5.4 tree, but we never noticed a
problem when we did initial bring up of our board with linux-4.14 a couple
years ago. When I fixed the device tree to use the correct phy address 4
for our board. The problem went away and the Ethernet port now works
properly on linux-5.4.

-Jon