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

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

[Jacek Drewniak]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20180424/29737e4b/attachment.html>

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

[Jacek Drewniak]

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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20180424/8b537c3f/attachment.html>

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

[Jacek Drewniak]

I've tested which versions works. It seems that last tagged 2018.02.1 still
works but master doesn't.

Here is diff:

$ diff -r sdcard.master/1/ sdcard.2018.02.1/1
Binary files sdcard.master/1/[SYS]/Journal and
sdcard.2018.02.1/1/[SYS]/Journal differ
Only in sdcard.master/1/bin: arch
Binary files sdcard.master/1/bin/busybox and sdcard.2018.02.1/1/bin/busybox
differ
Only in sdcard.master/1/bin: nuke
Only in sdcard.master/1/bin: resume
Only in sdcard.2018.02.1/1/dev: console
Only in sdcard.2018.02.1/1/lib: firmware
Only in sdcard.2018.02.1/1/lib: ld-uClibc-1.0.28.so
Only in sdcard.master/1/lib: ld-uClibc-1.0.29.so
Only in sdcard.2018.02.1/1/lib: libuClibc-1.0.28.so
Only in sdcard.master/1/lib: libuClibc-1.0.29.so
Only in sdcard.master/1/lib/modules: 4.14.29
Only in sdcard.2018.02.1/1/lib/modules: 4.9.79
Only in sdcard.master/1/sbin: run-init
Binary files sdcard.master/1/usr/bin/getconf and
sdcard.2018.02.1/1/usr/bin/getconf differ
Only in sdcard.master/1/usr/bin: hexedit
Only in sdcard.master/1/usr/bin: setfattr
diff -r sdcard.master/1/usr/lib/os-release
sdcard.2018.02.1/1/usr/lib/os-release
2c2
< VERSION=2018.05-git-00959-g2254a32
---
> VERSION=2018.02.1
4,5c4,5
< VERSION_ID=2018.05-git
< PRETTY_NAME="Buildroot 2018.05-git"
---
> VERSION_ID=2018.02.1
> PRETTY_NAME="Buildroot 2018.02.1"

JD

wt., 24 kwi 2018 o 21:19 Jacek Drewniak <yahuza.pl@gmail.com> napisa?(a):

> 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
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20180426/3ef983dc/attachment.html>

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

[Andreas Ziegler]

Hi Jacek,

> Date: Tue, 24 Apr 2018 19:19:41 +0000
> From: Jacek Drewniak <yahuza.pl@gmail.com>
> To: buildroot at busybox.net
> Subject: Re: [Buildroot] enc28j60 ethernet module doesn't work on rpi0

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

This may be related to your init system. Probably mdev was not started 
previously or did not pick up kernel events. Check if mdev is 
initialized somewhere during system initialization. For example, if you 
use busybox, there should be a /etc/init.d/S10mdev script. Also mdev 
needs a line for modprobe in /etc/mdev.conf. This config item is present 
in the current buildroot configuration, but was missing before 2016.

>> - I can modprobe enc28j60.ko and it appears in lsmod but nothing else
>> happens (no eth0 in ifconfig)

If you start the interface manually after loading the driver using 'ifup 
eth0', it should be visible.

Kind regards,
Andreas