[linux-dvb] Re: AW: Re: AW: AW: Re: Avermedia 771 on Gentoo FIXED!

[Peter Henderson <peter.henderson@starjar.com>]

I think I've fixed it.

There is an  integer underflow bug in mt352.c
need to change line 517 (based on rev 1.7 in cvs)
from
   tmp =  6 * freq + IF_FREQUENCYx6;
to
   tmp = ((param->frequency*6)/1000000) + IF_FREQUENCYx6;

This affects any multiplex which is on a Positive or Negative offset.
(So 4978333330Hz fails but 690000000Hz would be fine)

So Ben this should fix your problem as Crystal Palace is all Pos/Neg 
offsets.





As  a side note.
Can FEC_NONE be added as a case to the LP code rate switch statements 
(and probably the HP as well) as this was the original reason I couldnt 
tune anything and had to comment out the default error return.



Peter.




Peter Henderson wrote:

> Hiya.
>
>
>
>
> Andreas Witte wrote:
>
> > Hallo Both! =)
> > Hello Ben, Hello Peter.
> > (what a monstermail, ive snipped it...)
> >
> > Ive done that all on my sources in /usr/src/. But it cant be the 
> > worst idea
> > to secure the original kernel-tree...
> > Mainly i did that all like Peter show here. The kraxel-patch patches 
> > just
> > the bttv-driver (and some other things)
> > and put the avermediatv in it with the right id. So i would say it 
> > makes no
> > sense anymore to give the card-option
> > with it - it should autodetect. Im still unsure about that 
> > i2c_hw-switch.
> >
> > What i want to ask you, Peter, is: Is it posible in your area to tune on
> > frequencies smaller/equal 230Mhz ?
> >  
> I cant really tell, the mulriplexs here are on 474, 498, 522 554, 578 
> & 690MHz
> Although Im still having trouble tuning to some of them, 474 690 and 
> 578 work but these do not have an offset. The remaining multiplexs 
> have a negative offset and dont tune. Perhaps this is a common cause??
>
> > We got around 7 or 8 Programs on 177,5Mhz and 191,5Mhz here in 
> > Berlin. Are
> > there any channels located on
> > that frequencies in your area? I still have the problem that i cant tune
> > those channels. The package say, it
> > support those frequencies. If it will not, this card is mainly 
> > useless for
> > Berlin. I didnt tried this piece
> > in a wintel box yet, so i cant say... any idea here?
> >  
> Well the zarlink data sheet says it works on VHF and UHF, and my 
> Avermedia box says the same. So I guess it should work, probably a bug 
> lurking in the code somewhere.
>
> > If there is anyone outside that could tell me if the card REALLY 
> > supporting
> > the 2 frequencies above?
> > Anyone that tried this thing in a Wintel-PC?
> >
> > Btw. i find the tuning-speed is damn fast with that card. Much faster 
> > than
> > the tuning speed of the
> > technotrend card (which also runs in my pc).
> >
> > Crazy that you should hack your mt352.c. It works out of the Box for me,
> > with just an error while
> > inserting:
> >
> > ***
> > mt352_read_register: readreg error (ret == -121)
> > ***
> >
> > Im not sure if that's maybe the cause that it wont tune under 230Mhz 
> > (i mean
> > i never
> > ever get a lock. The status switches from 01 to 05 and back, but no 
> > lock).
> >
> > Regards,
> > Andreas
> >
> > -----Original Message-----
> > From: linux-dvb-bounce@linuxtv.org 
> > [mailto:linux-dvb-bounce@linuxtv.org]On
> > Behalf Of Peter Henderson
> > Sent: Wednesday, July 14, 2004 1:46 AM
> > Cc: linux-dvb@linuxtv.org
> > Subject: [linux-dvb] Re: AW: Re: AW: AW: Re: Avermedia 771 on Gentoo
> >
> >
> > Hi Ben
> >
> > While its still fresh in my mind.
> > This is what I did.
> >
> > 1) Untar 2.6.7 Linux kernel sources to a dir
> > 2) checkout linux tv dvb-kernel module
> > 3) run makelinks from the dvb-kernel dir on the linux srcs  (makelinks
> > /home/peter/tmp/dvb/2.6.7)  NOT the src in /usr/src or the src in the
> > dvb-kernel dir
> > 4) apply the kraxel patch. (
> >    cd /home/peter/tmp/dvb/2.6.7
> > then
> >    patch -p1 <patch-2.6.7-kraxel
> >
> > 5) config + build the kernel as normal.
> >
> >
> > Note I hacked mt352.c before step 5 as i was experiencing tuning 
> > problems.
> > commented out line 420
> >
> >
> > Hope this helps a bit.
> >
> > Peter
> >
> >
> > Ben Rometsch wrote:
> >
> > Hi Andreas,
> >
> > Still cant get anything out of zap. Driving me nuts. Anyway, I am not 
> > sure I
> > am applying the bytesex patch correctly. Should it be applied to the 
> > linux
> > src in /usr/src/linux, or should it be applied to the dvb-kernel tree?
> >
> > What is the command you issue to apply the patch?
> >
> > Thanks,
> > Ben
> >
> >
> >
> >
> >
> >
> >