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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