Re: [DistroKit] ethernet on SAMA5D2-SOM1-EK1

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello,

On 19.03.21 14:17, Alexander Dahl wrote:
>> On Wed, Mar 17, 2021 at 10:30 AM Alexander Dahl <ada@thorsis.com> wrote:
>>> In barebox shell it uses a random mac address (the real one is in a small 
>>> eeprom on the SoM), dhcp and ping successful.

Didn't know about the EEPROM. Thanks for the info.
I mainly used it for the Giant board, the SOM1 was more of a byproduct. 

>>> 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 also have boards based on that SoC, but those use a different ethernet phy. No problems with kernel v5.4 and v5.10 series.
> 
>> 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.
> 
> Nice to know. Meanwhile I digged in my old projects and managed to get a modified DistroKit with at91bootstrap 3 and u-boot running, with kernel 4.19.x and everything works just fine, including ethernet. :-)
> 
> (The hardware itself is also modified, I can not just use mainline dts, but that's not the point.)
> 
> That means to me, there are still some open working spots for barebox and/or DistroKit to fully support that board.

I can confirm that barebox networking works, but that Linux fails either with:

[   44.790186] macb f8008000.ethernet eth0: no PHY found

or that no carrier is detected. Something is amiss indeed.

Cheers,
Ahmad

> 
> Greets
> Alex
> 
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