[coreboot] TV-Out Plan - need suggestions
joe at settoplinux.org
Sun Apr 20 15:57:03 CEST 2008
Unlike most VIA's where the TV-out is built in to the northbridge, Intel
uses a separate chip for the TV-out, in this case it is a Conexant
CX25873-13 High Performance Video Encoder. The chip is onboard, just
separate from the northbridge. And the tricky part is that the Conexant
CX25873 needs to be initialized after the graphics (timing, clocking, etc),
hence the need for a custom graphics init. Does that make sense??
From: Corey Osgood [mailto:corey.osgood at gmail.com]
Sent: Saturday, April 19, 2008 11:20 PM
To: joe at settoplinux.org
Cc: Peter Stuge; Coreboot
Subject: Re: [coreboot] TV-Out Plan - need suggestions
Erm, is the tv-out part of the onboard video, or is it a separate chip? I
thought it was a separate chip, so it wouldn't go in with the i830 stuff (in
case someone else has tv out with another board and a different chip). But
if it's onboard, just ignore me.
On Sat, Apr 19, 2008 at 8:51 PM, Joe <joe at settoplinux.org> wrote:
That's what I was thinking Peter, I'll have to look into this further. Just
think, this will be the first coreboot board with TV-out that will not
depend on any outside drivers :-)
Although there are Linux drivers that could be used to change the settings
once in Linux (overscan, etc).
> -----Original Message-----
> From: coreboot-bounces at coreboot.org [mailto:coreboot-bounces at coreboot.org]
> On Behalf Of Peter Stuge
> Sent: Saturday, April 19, 2008 1:42 PM
> To: Coreboot
> Subject: Re: [coreboot] TV-Out Plan - need suggestions
> On Fri, Apr 18, 2008 at 05:50:15PM -0400, Corey Osgood wrote:
> > > > 2. Then setup a init (that would program the registers, and fire
> > > > it up for the Tv encoder coreboot-v2/src/drivers/tv-out which
> > > > could also be called from the nothbridge vga.c.
> > Again, do this inside mainboard.c, so any other systems that might
> > use i830 don't get tv init interfering with anything else.
> Please make the TV stuff generic code for the chipset that is enabled
> by an option in Config.lb.
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