RE: Crosstool for EBD9312..

Hello Burian,

The framebuffer implementation you get in the unofficial cirrus tree
(ep93xx-2.6) is not accelerated. The latest cirrus release (for
linux-2.4.21-rmk1) seems acclerated. Diff the source for details.

Note that the unaccelerated 2.6 driver and the accelerated
2.4.21-rmk1-crus-whatever driver do not have a common anchestor,
the 2.6. was implemented from scratch, using fb-skeleton.c

OK.

To explain it short:

if hardware acceleration is not available you'll have to emulate the
missing features in software (always possible), which is usually slow.

Yes, right. This will be painful (performance wise).

if hardware acceleration is available but the driver does not use it
(emulates it as if it wasn't there) you still have a software-only

driver.
 
You mean if the existing driver support is not accelerated, we need to
emulate it in software again. But Why, can't we rewrite the driver at
some places & make it work?

if hardware acceleration is available and the driver makes use of
it you've got a "accelerated" driver. In the ep93xx's case
the "raster engine" is used then.

What is the raster engine? I goggled it, but did not find any thing
strong enough.
 
My actual requirement is to rotate the screen by 90 degrees. Maillists
ask me to use Xfree86 as it already has such kind of a support to rotate
the screen. 

Are there any side affects if I make use of the X server & rotate the
screen. I mean is there any application that makes use of the video
buffer directly without using X server and may fail to rotate the screen
as we are rotating the screen at X server level and not at fb level.

Also, if my device uses the console the screen rotation at X server
level will not work. I mean if.

Thanks & Regards,
mukund jampala



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