PIDVR-7: Configure FreeSat Hardware

Kernel version is 3.12.28

pi@testpi ~ $ uname -a
Linux testpi 3.12.28+ #709 PREEMPT Mon Sep 8 15:28:00 BST 2014 armv6l GNU/Linux

So will need to build the V4L package

Decided as DVBSky actually have Linux support and provide drivers, better to use theirs

Get Kernel headers etc

root@testpi:/home/pi# apt-get update
root@testpi:/home/pi# apt-get install gcc-4.7 cpp-4.7 dkms
root@testpi:/home/pi# wget http://www.niksula.hut.fi/~mhiienka/Rpi/linux-headers-rpi/linux-headers-3.12.28%2b_3.12.28%2b-2_armhf.deb
root@testpi:/home/pi# dpkg -i linux-headers-3.12.28+_3.12.28+-2_armhf.deb

Install Driver

root@testpi:/home/pi# cd /usr/src
root@testpi:/usr/src# wget http://www.dvbsky.net/download/linux/media_build-bst-13-140619.tar.gz
root@testpi:/usr/src# tar xvzf media_build-bst-13-140619.tar.gz
root@testpi:/usr/src# cd media_build-bst-13
root@testpi:/usr/src/media_build-bst-13# wget http://www.dvbsky.net/download/linux/sit2-RPi.zip
root@testpi:/usr/src/media_build-bst-13# unzip sit2-RPi.zip
root@testpi:/usr/src/media_build-bst-13# tar xvzf sit2.o.RPi.tar.gz
root@testpi:/usr/src/media_build-bst-13# tar xvzf sit2.o.RPi.dvbc.tar.gz 
root@testpi:/usr/src/media_build-bst-13# ./v4l/build_x86.sh # Seems to copy a file we need for make, without it make fails
root@testpi:/usr/src/media_build-bst-13# cp sit2.o.RPi v4l/
root@testpi:/usr/src/media_build-bst-13# cp sit2.o.RPi v4l/sit2.o
root@testpi:/usr/src/media_build-bst-13# cp sit2.o.RPi.dvbc v4l/
root@testpi:/usr/src/media_build-bst-13# make

The make takes quite a while to run, so I've left it to it for the time being.

Just seen the following warnings flash by

WARNING: could not find /usr/src/media_build-bst-13/v4l/.sit2.o.cmd for /usr/src/media_build-bst-13/v4l/sit2.o
WARNING: "dma_buf_export" [/usr/src/media_build-bst-13/v4l/videobuf2-dma-contig.ko] undefined!

The first relates to our module, which isn't great. Will let the compile finish and see if it actually causes any issues though.

The make has finally completed

root@testpi:/usr/src/media_build-bst-13# make install
root@testpi:/usr/src/media_build-bst-13# cd /lib/firmware/
root@testpi:/lib/firmware# wget http://www.dvbsky.net/download/linux/dvbsky-firmware.tar.gz
root@testpi:/lib/firmware# tar xvzf dvbsky-firmware.tar.gz 
root@testpi:/lib/firmware# mv dvbsky-firmware/* ./
root@testpi:/lib/firmware# reboot

Once the box comes back up, there should (hopefully) now be a /dev/dvb

root@testpi:/home/pi# ls /dev/sdb
ls: cannot access /dev/sdb: No such file or directory

Nuts.....

It would seem that the V4L modules have compiled incorrectly

root@testpi:/home/pi# insmod /lib/modules/3.12.28+/kernel/drivers/media/dvb-frontends/sit2fe.ko 
Error: could not insert module /lib/modules/3.12.28+/kernel/drivers/media/dvb-frontends/sit2fe.ko: Invalid module format

Wondered if it was the use of the x86 specific script earlier, but turns out it doesn't do a huge amount.

OK, working on the assumption I've ballsed something up. Starting again, using slightly different sources this time

root@testpi:/usr/src/media_build-bst-13# make clean
root@testpi:/usr/src/media_build-bst-13# cd ..
root@testpi:/usr/src# rm -rf media_build-bst-13
root@testpi:/usr/src# tar xvzf media_build-bst-140128.tar.gz 
root@testpi:/usr/src# cd media_build-bst
root@testpi:/usr/src/media_build-bst# wget http://www.dvbsky.net/download/linux/sit2-RPi.zip
root@testpi:/usr/src/media_build-bst# unzip sit2-RPi.zip 
root@testpi:/usr/src/media_build-bst# tar xvzf sit2.o.RPi.tar.gz 
root@testpi:/usr/src/media_build-bst# cp sit2.o.RPi v4l/sit2.o
root@testpi:/usr/src/media_build-bst# make && make install

Now I need to find something else to do while that runs :)

Whilst waiting for the new compile, figured would take a quick look at the issues from the previous one

root@testpi:/home/pi# modinfo /lib/modules/3.12.28+/kernel/drivers/media/dvb-frontends/sit2fe.ko 
filename:       /lib/modules/3.12.28+/kernel/drivers/media/dvb-frontends/sit2fe.ko
version:        1.00
license:        GPL
author:         Max Nibble <nibble.max@<Domain Hidden>>
description:    sit2 demodulator driver
depends:        
vermagic:       3.12.28 preempt mod_unload modversions ARMv6 

root@testpi:/home/pi# uname -a
Linux testpi 3.12.28+ #709 PREEMPT Mon Sep 8 15:28:00 BST 2014 armv6l GNU/Linux

Syslog shows

Nov  6 16:11:58 testpi kernel: [  247.383094] sit2fe: disagrees about version of symbol module_layout
Nov  6 16:17:06 testpi kernel: [  555.058068] sit2fe: disagrees about version of symbol module_layout
Nov  6 16:28:48 testpi kernel: [ 1257.375108] sit2fe: disagrees about version of symbol module_layout

Suggests this compile is going to end in the same result, so have killed it off for the time being

root@testpi:/usr/src/media_build-bst# cd /lib/modules/3.12.28+/build
root@testpi:/lib/modules/3.12.28+/build# mv Module.symvers Module.symvers.bkup
root@testpi:/lib/modules/3.12.28+/build# wget https://github.com/raspberrypi/firmware/raw/53d1ae311226b5cd7ea1277832139b74b2bb0f90/extra/Module.symvers

Got the GitHub link by looking for the relevant version in Module.symvers' history (https://github.com/raspberrypi/firmware/commits/master/extra/Module.symvers)

Have done a make clean and just started make again

Got the same as in the initial compile

make[3]: *** No rule to make target '/usr/src/media_build-bst/v4l/sit2.o', needed by '/usr/src/media_build-bst/v4l/msp3400.o'.  Stop.
Makefile:1230: recipe for target '_module_/usr/src/media_build-bst/v4l' failed
make[2]: *** [_module_/usr/src/media_build-bst/v4l] Error 2
make[2]: Leaving directory '/usr/src/linux-headers-3.12.28+'

Was fixed previously by running the x86 build script but can't quite see how that could have fixed it as it copies a single module (which we wind up overwriting anyway),
Looking at it though, our make clean blew away the RPi module we copied in earlier

root@testpi:/usr/src/media_build-bst# cp sit2.o.RPi v4l/sit2.o
root@testpi:/usr/src/media_build-bst# make

Again, during MODPOST got

WARNING: could not find /usr/src/media_build-bst/v4l/.sit2.o.cmd for /usr/src/media_build-bst/v4l/sit2.o
WARNING: "dma_buf_export" [/usr/src/media_build-bst/v4l/videobuf2-dma-contig.ko] undefined!

Will see at the end if it makes any difference (assuming we've fixed the initial issue).

Starting to wish I'd cross-compiled rather than getting the Pi to do it, but it's a good chunk of the way through now.

root@testpi:/usr/src/media_build-bst# make install
root@testpi:/usr/src/media_build-bst# reboot
pi@testpi ~ $ ls /dev/dvb
adapter0

We're good to go :)