On Friday 11 March 2005 14:36, Mukund JB. wrote:

Hi adaplas,

Thankful to u for making things clear at every level.

quoted

quoted

But when I try this without accel=1 rotation fails. Can u just

narrate

quoted

quoted

me what is accel accentually doing?

Because if accel is on, the driver is using it's own version of

drawing

quoted

functions which are flexible enough that additional features can be

added,

quoted

such as screen rotation.

If accel is off, the driver will use the generic functions which

cannot do

quoted

screen rotation.  Of course, one can write a software version that can

do

quoted

screen rotation.

So, u mean the i810fb driver will process the command line parameters &
if finds the accel is "1" in the list, it will use its own functions or
else it will use the generic functions provided in the fbgen.c file.

Above is correct, except that i810fb, if accel is disabled will use the
functions in fbcon-cfb*.c, not fbgen.c.

This is my understanding about fb driver architecture

			Application
			-----------
		  XFree86 / Directfb (Embedded)
			-----------
			 FB driver
			-----------
			 HARDWARE

Are these files below a part of fb driver or do they come under a
different level in fb driver architecture?

The above is correct, assuming that XFree86 uses the 'fbdev' driver.

fbcon.c - low level framebuffer based console driver
fbcon-cfb* - low level framebuffer based operations for 8 bpp packed
pixels
How do I differentiate between the above two?

fbcon.c is the glue between console and fbdev.  fbcon-cfb* contains
generic drawing functions for framebuffers with packed pixel format.

fbcmap.c 	- It handles color mapping
fbcon-plan2p*

I find fbdevhw.a & I find groups referring to it.

fbdevhw, if I'm not mistaken, came from XFree86/Xorg.  It contains
helper functions used by XFree86 to talk to fbdev.

I think it is a library. If so, give me some inputs where we can use it.
Please do correct if I am going OFF-TRACK understanding FB drivers.

Where exactly should I place the fbdevhw.a in the above shown
architecture?

Probably between  XFree86 and fbdev.

Tony





-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click