[Buildroot] enc28j60 ethernet module doesn't work on rpi0

From: Jacek Drewniak <yahuza.pl@gmail.com>
To: buildroot@busybox.net
Subject: [Buildroot] enc28j60 ethernet module doesn't work on rpi0
Date: Tue, 24 Apr 2018 19:19:41 +0000	[thread overview]
Message-ID: <CAPzLZqS-C=ZOBgbeRaBGDObdnpchpK47U60NLDfG8C_p0KqiLA@mail.gmail.com> (raw)
In-Reply-To: <CAPzLZqQaSiPWqcW=JgbtwtvDHJYq171ydFXBeSCsiLZJhDfoXg@mail.gmail.com>

I've found something. I've tried previous version of buildroot: *git
checkout 2016.11*
I've built this particular version, done other steps I mentioned in
previous post, *and now it works*! (not completely, I have to configure the
interface now) but *drivers now are loaded during boot and eth0 appeared. *

It seems that problem is with loading modules at all. Now after `Starting
mdev...` I can see that others modules loaded: gpiomem, watchdog.

My boot sequence: https://pastebin.com/aXsKu8TY

Regards
Jacek

wt., 24 kwi 2018 o 14:31 Jacek Drewniak <yahuza.pl@gmail.com> napisa?(a):

> Hello everyone!
>
> I have external enc28j60 connected through SPI to Raspberry Pi Zero but
> there is no eth0 interface available.
>
> *In this same hardware configuration eth0 works fine with Raspbian Lite.*
>
> Steps, which I've made:
> 1. Clone buildroot from official repo
> 2. make raspberrypi0_defconfig
> 3. Add BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
> 4. Make and burn image into sd card
> 5. Add `enc28j60.dtbo` into overlays directory on boot partition
> 6. Add  dtparam=spi=on and dtoverlay=enc28j60 into config.txt
>
> * Now I can see enc28j60 under: /proc/device-tree/soc/spi at 7e204000
> * Driver module is present
> under: /lib/modules/4.14.29/kernel/drivers/net/ethernet/microchip/enc28j60.ko
>
> I have added eth0 to /etc/network/interfaces but during boot I can only
> get message  `Starting network: ifup: ignoring unknown interface eth0` or
> `Starting network: ip: SIOCGIFFLAGS: No such device`
>
> Some facts:
> - ifconfig -a shows only lo interface
> - enc28j60.ko is not loaded during boot
> - I can modprobe enc28j60.ko and it appears in lsmod but nothing else
> happens (no eth0 in ifconfig)
> - Here it is my dmesg: https://pastebin.com/Jy2H9KU1
> - Modinfo output: https://pastebin.com/xkDPY5Zr
>
> I found very similar story with happy end, but I have mdev enabled and it
> still doesn't work.
>
> http://buildroot-busybox.2317881.n4.nabble.com/Bug-9541-New-Platform-drivers-autoloading-from-info-in-device-tree-does-not-work-td153712.html
>
> Best regards
> Jacek Drewniak
>
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