Guido, you may be interested in this thread.
Regards Georgina
-------Original Message-------
Date: Wednesday, March 05, 2003 09:47:39 AM
Subject: Re: [Linux-fbdev-devel] Advice sought on approach.
On 5 Mar 2003, Alex Bennee wrote: > On Wed, 2003-03-05 at 13:26, Antonino Daplas wrote: > > On Wed, 2003-03-05 at 20:37, Alex Bennee wrote: > > > Having read the fb-dev docs on www.linux-fbdev.org I'm a little confused > > > as to what actually puts data into the framebuffer. Most of the > > > framebuffer drivers just seem to deal with resolution and colourmap > > > settings. Is this a case of having to re-implement the fbcon drivers as > > > well to get what I want? > > The pixels placed to the framebuffer are all done in the fbcon-cfb*.c > > modules (if you use the generic functions). This is for standard > > character drawing. The logo is drawn indepently (fbcon_show_logo in > > fbcon.c). User applications write directly to the framebuffer via the > > mmap() function. > > I think I understand now. When the fb_set_disp function is called I fill > in the display struction with the console display operations. I've got > two choices now: > > 1. Create a new fbcon_cfb16 file which notes the changed areas before > calling the generic function. > > 2. Patch the current fbcon_cfb16 (with a CONFIG option) to add the > change tracking facility in a more generic way. > > I guess the question is is it worth doing 2 as a potential upstream > patch? Or is this sort of thing so specialised I should just keep it all > packed in my own fb driver? > > I guess I can't easily implement user access via mmap without uploading > the entire screen, which I'm not intending to do anyway because all I > really need is the console support - at least for now.
If all you need is console support, please take a look at drivers/video/newport_con.c, for the SGI Indy.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [EMAIL PROTECTED]
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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