[Letux-kernel] Ethernet interface on Beaglebone Black broken since 5.15.0-rc1-letux+

Jean Rene Dawin jdawin at math.uni-bielefeld.de
Fri Sep 24 00:06:02 CEST 2021


Hi,

since 5.15.0-rc1-letux+ the ethernet interface on Beaglebone Black no
longer works.

In the boot messages for 5.14.6-letux+ there is

[    0.867514] random: fast init done
[    0.867704] random: crng init done
[    0.956608] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6, bus freq 1000000
[    0.956721] libphy: 4a101000.mdio: probed
[    0.958786] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
[    0.959188] cpsw 4a100000.ethernet: initialized cpsw ale version 1.4
[    0.959234] cpsw 4a100000.ethernet: ALE Table size 1024
[    0.959389] cpsw 4a100000.ethernet: Detected MACID = 54:4a:16:bb:86:e9
[    0.974126] am335x-bandgap 44e10448.bandgap: hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().

but with 5.15.0-rc1-letux+ there is just

[    0.725388] random: fast init done
[    0.729446] random: crng init done
[    0.768411] am335x-bandgap 44e10448.bandgap: hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().

and the interface is not present after boot.

I would like to bisect the issue but I'm not sure how.
If I do for example

git bisect good a47fe0df52b98d2eb381ce282ba0208fed446acd
git bisect bad dd2caf156ef189647af40d92a587d4c59a2f8442

it says

Bisecting: a merge base must be tested
[7d2a07b769330c34b4deabeed939325c77a7ec2f] Linux 5.14

But 7d2a07b769330c34b4deabeed939325c77a7ec2f is the upstream Linux
commit without the letux-patches, right?

What would be the best way to find the commit which caused the issue?

Regards,
Jean Rene


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