On Saturday 11 September 2004 13:19, Dave Airlie wrote: > The other thing I think some people are confusing is 2.4 fbdev and 2.6... > there is no console support in 2.6 fbdev drivers, it is all in the fbcon > stuff, so the fbdev drivers are only doing 2d mode setting and monitor > detection, some points I've considered are:
Correct. fbdev is almost completely separate from fbcon. And you can actually rip out fbdev and place it anywhere you want. As long as fbcon has access to a pointer to framebuffer memory, and the characteristics of the display such as depth, pitch, etc, then the framebuffer console will work. Throw in a few functions, such as for buffer flipping, and fbcon will be happy. Hardware acceleration is entirely optional, and most drivers except for a few (such as vga16fb or amiga) can use the cfb_* drawing functions. There's also a recent change in the latest bk tree that changes the intialization order of the framebuffer system. Previously, fbcon triggers fbmem, then fbmem triggers each individual drivers. This method requires that a working fbdev is present, otherwise fbcon will fail (although you can do a con2fbmap later, or modprobe a driver). With the change, the order is reversed, driver->fbmem->fbcon. This change is probably significant because fbcon can wait until an active framebuffer activates. In theory, one can have a process (kernel or userland) change the video mode, then provide the in-kernel driver with the necessary information about the layout of the framebuffer. When this in-kernel driver gets the necessary information, it can trigger fbcon. This in-kernel driver need not know anything about the hardware (unless 2D acceleration is needed). Tony ------------------------------------------------------- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php -- _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
