Date: Wed, 12 Feb 1997 08:06:51 -0700 (MST) From: Thomas Roell <roell@crab.xinside.com> To: Amancio Hasty <hasty@rah.star-gate.com> Cc: Randall Hopper <rhh@ct.picker.com>, multimedia@freebsd.org Subject: Re: Bt848 driver & Wincast -- some success Message-ID: <199702121506.IAA08268@xeno.xinside.com> In-Reply-To: <199702120504.VAA26988@rah.star-gate.com> References: <19970211232548.58351@ct.picker.com> <199702120504.VAA26988@rah.star-gate.com>
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In your message of 11 February 1997 you write:
> Hi,
>
> You need the B848 Databook from Brooktree if you want to hack on the
> driver, period.
>
> What is your CPU and motherboard chipset, example Natoma or Triton...
>
> If you have a Mercury chipset, then you don't have enough PCI bandwith
> to drive a 640x480 32bits picture. Also try playing with the PCI parameters
> in your BIOS. Your PCI clock rate should be around 32 or so and not 60 or
> higher.
>
> You can try 320x240 with something like 15bits or 8bits color depth.
>
> The ghostimage that you are experiencing in your system is an indication
> that your PCI chipset is not able to keep up with the Bt848.
>
> The driver does not have the ioctls to transfer video to memory and
> is not hard to add . I can provide this feature before the end of
> the week;however, if you want to take advantage of this feature
> then you will have to ask the XFree86 team or peruse thru their
> release notes for an appropiate video card which supports linear
> frame buffering.
*smile* Or Xi Graphics (the artist formerly known as ...)
Actually writing YUV422 and 320x240 makes more sence that 15bpp or
8bpp TrueColor. The graphics chip can do the color-space conversion.
What I'm really curious about is whether the Bt848 can do
doublebuffering. I mean an even field into buffer A and an odd field
into buffer B.
- Thomas
--
Thomas Roell /\ Ein Nasshorn und ein Trockenhorn
Xi Graphics / \/\ _ spazierten durch die Wueste,
roell@xinside.com / / \ \ da stolperte das Trockenhorn,
/ Brumpft! \ und's Nasshorn sagte: "Siehste!"
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