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

[Andreas Kemnade]

Hi,

On Fri, 24 Sep 2021 00:06:02 +0200
Jean Rene Dawin <jdawin at math.uni-bielefeld.de> wrote:

> 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?
> 
If you can see this issue on mainline (maybe with just a custom config
or something) and do not need features in letux-kernel, then you can
bisect just mainline. 

Regards,
Andreas