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add Nebula/PCTV README and insmod script contributed by Richard Walker

Hi all,

A few people have asked me about how I got the Nebula and PCTV cards working,
so I thought I'd try and explain it here.  First of all, I did not write the 
driver - all the credit for that must go to Florian Schirmer.  Unfortunately, 
I've been unable to get hold of him for ages.  :(

I use Linux kernel 2.4.21, straight from kernel.org.  I find that this is 
the *only* way to go when you are experimenting with bleeding-edge stuff like 
DVB and Dxr3.  Do the usual to build your kernel.  (remember to enable the 
V4L functionality)  I'd recommend you install and test your kernel, rather 
than diving straight into the Nebula stuff.

Download http://bytesex.org/patches/2.4.21/11-v4l2-api-2.4.21-rc4.diff.gz and 
apply this to your kernel source tree.  For example:

  $ cd /usr/src
  $ patch -p0 < ~/11-v4l2-api-2.4.21-rc4.diff

This will patch your kernel to include support for VideoForLinux 2.

For those who don't know, kernels < 2.5 only support V4L 1 out-of-the-box. If 
you are using kernel 2.5.x (or 2.6.x) then V4L2 is built-in.

You need to use 'dvb-kernel', along with 'bttv' to talk to the Nebula card.

Download http://bytesex.org/bttv/bttv-0.9.11.tar.gz and unpack it.

Grab dvb-kernel from CVS:

  $ cvs -d :pserver:anonymous@linuxtv.org:/cvs/linuxtv login
  $ cvs -d :pserver:anonymous@linuxtv.org:/cvs/linuxtv co dvb-kernel

Modify the 'dvb-kernel/build-2.4/getlinks' script to support bttv by adding:

  "for x in `find ../../bttv-0.9.11 -name "*.[h]"` ; do
          ln -vs $x `basename $x`
  done"

to the end.

This assumes that you have placed the 'bttv-0.9.11' directory next to 
'dvb-kernel'.

Now we have to apply a patch to bttv.  This allows the dvb-bt8xx module to 
directly access some I2C functions.  Copy the attached patch into your bttv 
directory, and do:

  $ cd bttv-0.9.11
  $ patch -p0 < i2c-if-0.9.11.patch

then you can build bttv (I just do 'make' and 'make install').

Not, at last, the DVB stuff can be built!  Just do it the usual way:

  $ cd dvb-kernel/build-2.4
  $ ./getlinks
  $ make
  $ make install

Use the insmod-bt8xx.sh script in the build-2.4 directory to start and stop 
your drivers.  At this point, I just run VDR, and it all works great!  :)

Please feel free to question or improve any part of this document.  I think it 
would benefit everyone if we keep it on the mailing list.

Cheers,
Richard Walker