[Xorg] The big multiconsole nasty

[Jon Smirl]

You also need another ioctl for retrieving the contents of the video
ROM. xfree should not be enabling this from user space. There are
kernel calls for doing this that work with hotplug. I have code for
this ioctl too.


--- Keith Packard <keithp at keithp.com> wrote:
> 
> Around 16 o'clock on Jun 29, Alan Cox wrote:
> 
> > 1. Multiple video cards means making RAC work across *multiple* X
> > servers running at once on a system each with its own console
> 
> A significant amount of the RAC effort involves sharing the standard
> VGA 
> I/O port and video memory addresses; if we accept that supporting
> multiple ISA
> video cards isn't along the critical path, we can probably delay a
> large 
> portion of this work and focus only on getting cards POSTed at boot
> time.
> 
> > 3. Borrowing things like BIOS mode switch functionality is going to
> > get really hairy.
> 
> But may well be necessary for the forseeable future -- Intel has no 
> current plan to document the i810 (et al) mode selection code, so
> we're 
> stuck with using the BIOS.
> 
> Seems like we need some level of kernel arbitration to keep the
> system
> stable; it could be as little as some PCI remapping ioctls and a
> little 
> lock for shared regions.
> 
> -keith
> 
> 
> 

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=====
Jon Smirl
jonsmirl at yahoo.com


		
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