[linux-dvb] Re: Still getting segmentation faults when I modprobebttv

[Michael Hunold <hunold@convergence.de>]

Hello Luke,

> I've just finished my new attempt, starting again from scratch, mostly
> following advice from Vincenzo Di Massa and Michael Hunold.
>
> This is what I did:
>
> 1. Unpacked 2.4.23 kernel, configured with video4linux, i2c, etc.
> 2. Build kernel & modules & installed both
> 3. cvs co dvb-kernel
> 4. ran getlinks script in dvb-kernel
> 5. make in dvb-kernel/build-2.4
> 6. install in dvb-kernel/build-2.4
> 7. Booted up the new 2.4.23 TV kernel
> 8. Run dvb-nebula script to start modules.
>
> BTW, I assume you don't have to be running the new kernel when you
> "make install" in dvb-kernel/build-2.4?  I.e., steps 5 & 6 can be done
> before step 7?
You need to boot the new kernel before doing anything with "dvb-kernel", 
 ie. move step 7 up to before step 3.

"dvb-kernel" always compiles its modules against the currently running 
kernel by resolving the /lib/modules/<kernel-version>/build/ link.

So you have compiled the driver against your old running kernel and most 
likely some driver structures have changed, so bttv and the dvb-bt8x8 
parts use different sizes for their basic structures.

> (It's also possible that Vincenzo meant I should also do the extra steps
> of unpacking bttv and patching it, and getting video4linux (2) and
> making and installing that too.  But I did not unpack, build and install
> video4linux-20031201.tar.gz - I just relied on what was in the released
> 2.4.23 kernel.)
The documentation is a little bit misleading, I admit. You definately 
need the "video4linux-xxxxyyzz.tar.gz" package from www.bytesex.org. You 
need to compile in all requirements for the in-kernel 2.4.23 bttv driver 
(that is i2c interface and i2c bitbanging stuff), so that the external 
driver can be compiled and run, too.

> I also get this error from "make install" in dvb-kernel/build-2.4
> depmod: *** Unresolved symbols in /lib/modules/2.4.23-tv/misc/dvb-bt8xx.o
That's not good. "depmod -ae" will show you the symbols that are 
missing. If everything fits together, no symbols should be unresolved, 
of course.

> # ./dvb-nebula start
> Inserting DVB modules into kernel./dvb-nebula: line 41:  1773 Segmentation fault
>       modprobe bttv
>
> And modprobe appears to have hung, so I'll need to reboot after I send
> this email.
> But the dvb-nebula script doesn't appear to pass the card parameter (I
> note that 104 = 0x68).  Does that matter?  If such a parameter is
> needed for the modprobe, I think it would have to be added to
> /etc/modules.conf, wouldn't it?
If you have "make install"ed the driver, you don't have to use the 
insmod script. Try it manually, so you can monitor the syslog to see 
what's actually happening.

Simply load the basic modules via modprobe:

> modprobe bttv card=0x68 i2c_hw=1
> modprobe dvb-bt8xx
> modprobe nxt6000

> luke
CU
Michael.



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