Re: Re: status

mån 2002-11-25 klockan 19.47 skrev James Simmons:

quoted

quoted

Geert is busy porting the Amigia driver to the new api. That means all the 
ilbm, iplan stuff will go away :-) 

I have first code for amifb, but it doesn't work yet, due to other problems
with 2.5.x on Amiga. I hope to fix these tomorrow...

Yeah!!!

quoted

Besides, we still need someone to take care of the Atari 2-byte interleaved
bitplanes (iplan2p*), since I don't have the hardware, and am not 100% sure 
how they work. But reviving 2.5.x on Atari will be even harder...

For what it's worth, the interleaved modes on atari works like this:

The bitplanes are interleaved on 16 bit big-endian word basis so if you
have two bitplanes, bit 0 of the first 16 pixels would be in the first
16 bit word in the display memory, bit 1 of the first 16 pixels would be
in the second word. With bit 0 I mean as masked out by & 0x0001 in C,
and bit 1 as masked out by 0x0002.

The Atari ST line support three resolutions by default:
320x200 4 bit planes
640x200 2 bit planes
640x400 1 bit plane

The Atari Falcon has a programmable clock so many resolutions are
possible and it also features a 8 bit planes mode and 16 bit high colour
mode.

P.S.
I don't have any Atari hardware myself anymore.

   Me neither. But there is a way to find out. A trick I used to figure 
out the hga framebuffer lay out. Build just the fbdev layer without fbcon. 
Then do a write to /dev/fbX to see what happens. 
   The way I have fbdev now is when you open /dev/fb0 the hardware mode is 
set. When you close the /dev/fb the hardware goes back to text mode. I did 
it this way so you could insmod the driver and NOT change the hardware 
state. Also fb_open is the function register_framebuffer needs just before 
take_over_console happens. The other benifiet is if X dies that uses 
/dev/fb to set it modes then the file will be closed automatically and teh 
hardware state will be set to a sane state. This is for the case of vgacon 
with fbdev. WHat about from fbco? Well that is easy since fb_open passes a 
falg to let us knwo if it is from userland for fbcon.

P.S
   It appears fbcon is totally broken in BK. I'm using the above trick to 
test the code. Tonight I'm going to work on making fbcon completely 
modular. Yeah!!!!



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