[coreboot] TV-Out Plan - need suggestions

Joe joe at settoplinux.org
Fri Apr 18 23:18:50 CEST 2008

Does anyone have any thoughts on this? I could really use some

Joseph Smith

> -----Original Message-----
> From: coreboot-bounces at coreboot.org [mailto:coreboot-bounces at coreboot.org]
> On Behalf Of joe at settoplinux.org
> Sent: Thursday, April 17, 2008 10:44 PM
> To: coreboot at coreboot.org
> Subject: [coreboot] TV-Out Plan - need suggestions
> Hello,
> Starting to work on the TV-Out code for the RCA RM4100, and I need some
> help. Here is the Logical Plan:
> 1. Setup a custom vga init (similar to Corey's vga.c for the cn700
> northbridge) that will call a i2c (i810_i2c.c which could be used for a
> bunch of intel nothbridges) driver from coreboot-v2/src/drivers/i2c/ that
> will setup communications with the Tv encoder via the GPIO (sda, sdl)
> lines in the nothbridge.
> 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.
> Here is where it gets tricky. I want to make it dynamic in the respect
> that you could specify from your mainboard directory:
> a. TV-out settings (with a header file??) like NTSC, PAl, resolution,
> macrovision, filters, etc.
> a. enable TV encoder usage (if yes setup i2c, otherwise just skip over it)
> b. Specify which Tv encoder to use
> This would broaden the horizons and allow other boards that have TV-out to
> use this code also. The only thing I can think to do is setup some global
> parameters? Suggestions?
> --
> Thanks,
> Joseph Smith
> Set-Top-Linux
> www.settoplinux.org
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