[lkml]   [1996]   [Jun]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: SVGA kernel chipset drivers.

On Fri, 31 May 1996, Albert Cahalan wrote:
> > Unlikely. The difference between a library driver running with
> > video ram mmap()'d (ie direct access) and io port access and a
> > kernel driver is probably that the kernel driver is slower due
> > to syscall overhead.
> Nope, the kernel can provide a framebuffer device in /dev that
> programs can mmap. IO port access is less critical.
> The real reasons for such a driver are reliability and security.

Could we PLEASE stop this framebuffer nonsense?

It's not going to happen. There are LOTS of cards that don't even _have_
framebuffers (and they are usually the really high-end ones, the ones
that people will want support for in the future). If they _do_ have a
framebuffer, then SVGAlib can do the mapping itself.

Finally, IO port acccess is not at all less critical. As far as I know,
there are _no_ PC graphics cards that you can really program without
using IO ports. Stuff like colourmaps etc are almost invariably done with
IO port access on PC's.


 \ /
  Last update: 2005-03-22 13:37    [W:0.741 / U:4.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site