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List:       linux-video
Subject:    [video4linux] Hello everybody
From:       alexb () jetsuite ! com (Alex Bakaev)
Date:       1998-07-23 17:19:25

Hi,

Just wanted to introduce myself as a new subscriber to the list.

My name is Alex Bakaev and I am the original developer of the Brooktree
bt848 video capture drivers for Win95 and WDM driver for Win98/NT5.
Recently I decided to port them to Linux and was pleasantly surprised
that a whole community exists around bt848.

As I'm coming up to speed with Linux, please excuse my possibly naive
questions.

Once again, hi everybody,

Alex Bakaev
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List:       linux-video
Subject:    Re: [video4linux] Hello everybody
From:       alexb () jetsuite ! com (Alex Bakaev)
Date:       1998-07-23 21:25:39

829 has the same decoder as 848 does ( except that 848 can capture even
and odd fields separately ), so if you control 848, you control ( almost
100% ) 829. 829 alone doesn't make much sense because it needs a 'host'
to control it ( a gfx chip ). So, support for 829 should be added in the
display drivers, really. The source base for this support may be the
same, of course ( except the I2C specifics of the gfx chips ).

Source code for the Bt848 WDM driver and Bt829 WDM driver ( for the ATI
chip ) is available on Win98/NT5 DDK. I haven't looked at 829 code in a
long while, but initially it borrowed from the 848 driver ( in the
decoder area )

Alex

Paulo Castro wrote:
> 
> Hi Alex
> 
> There is a lot about bt848 but few about bt829 (ATI AIW...)
> 
> Can you focus both at once ?
> 
> ATI say that they will not develop drivers for Linux...
> 
> Now this Internet effort is the hope to do so...
> 
> Best Regards
> PCastro
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List:       linux-video
Subject:    Re: [video4linux] Hello everybody
From:       Alan Cox <alan () cymru ! net>
Date:       1998-07-23 21:31:35

> 829 has the same decoder as 848 does ( except that 848 can capture even
> and odd fields separately ), so if you control 848, you control ( almost
> 100% ) 829. 829 alone doesn't make much sense because it needs a 'host'

The problem with ATI is that they don't document their external chip
interfaces for i2c. The overlay and multimedia registers I do know the
names and positions of in the memory map but they dont directly correlate
to obvious i2c values or I'd have posted a few test hacks for people
to try by now.

> to control it ( a gfx chip ). So, support for 829 should be added in the
> display drivers, really. The source base for this support may be the
> same, of course ( except the I2C specifics of the gfx chips ).

The XFree people want to put XFree support in for drivers going entirely
via the video card. Obviously that keeps it nicely out of our hair. The
alternative option - having X11 and the kernel arbitrate for the register
is sufficiently insane to be impractical in those cases.

Alan


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List:       linux-video
Subject:    Re: [video4linux] Hello everybody
From:       alexb () jetsuite ! com (Alex Bakaev)
Date:       1998-07-23 21:43:50

829 sample in the Win98 DDK should show how I2C is used in ATI's case.
Also, I'm not sure I understand the connection between I2C registers and
overlay and MM registers. They are completely independent ( but I might
be wrong on this one - I left ATI too long ago :) Of course, both must
be used to have anything useful come out of 829.

Alex

Alan Cox wrote:
> 
> > 829 has the same decoder as 848 does ( except that 848 can capture even
> > and odd fields separately ), so if you control 848, you control ( almost
> > 100% ) 829. 829 alone doesn't make much sense because it needs a 'host'
> 
> The problem with ATI is that they don't document their external chip
> interfaces for i2c. The overlay and multimedia registers I do know the
> names and positions of in the memory map but they dont directly correlate
> to obvious i2c values or I'd have posted a few test hacks for people
> to try by now.
> 
> > to control it ( a gfx chip ). So, support for 829 should be added in the
> > display drivers, really. The source base for this support may be the
> > same, of course ( except the I2C specifics of the gfx chips ).
> 
> The XFree people want to put XFree support in for drivers going entirely
> via the video card. Obviously that keeps it nicely out of our hair. The
> alternative option - having X11 and the kernel arbitrate for the register
> is sufficiently insane to be impractical in those cases.
> 
> Alan
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