Date: Sat, 29 Mar 1997 14:53:28 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Richard Tobin <richard@cogsci.ed.ac.uk> Cc: multimedia@freebsd.org Subject: Re: newest bt848 driver Message-ID: <199703292253.OAA12381@rah.star-gate.com> In-Reply-To: Your message of "Sat, 29 Mar 1997 22:37:41 GMT." <28072.199703292237@pitcairn.cogsci.ed.ac.uk>
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Oh, there are other PAL users some of them I believe are just hiding out.
Okay Luigi, where are you??
----
Yeap, the default dma_prog size allocation per the bug that you reported
for sure will not work for PAL.
Here is an approximate breakdown for NTSC (640*480 interlace) for a single
frame (240*320).
3840 = Interlaced lines * (full word size) * (4 instructions)
240 * 4 * 4
Plus a few more full words so the frame fits within the 4096 memory segment.
Looking forward to the NTSC/PAL version 8)
Have fun guys,
Amancio
>From The Desk Of Richard Tobin :
> > The reason why it is working is because of round_page in vm_page.c
> > rounds up to the nearest page so get_bktr_mem is getting 1 Page (4096 bytes
).
>
> I think I was having problems because the DMA program has a few
> instructions for each scan line, and PAL has more lines than NTSC!
>
> I will shortly be releasing a version with PAL support for testing (I
> don't know if there are any other PAL users out there, but I want to
> know whether I've broken the NTSC code).
>
> -- Richard
>
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