nanogui: Arm device with 4bpp and planes==0
Subject:
Arm device with 4bpp and planes==0
From:
"Yair, Oren" ####@####.####
Date:
16 Jul 2009 09:15:55 -0000
Message-Id: <6385EF5E30011E42B75895D851412B2A5F616F6C20@ILMA1.IL.NDS.COM>
Hi,
I have an ARM device that works with 4bpp. When I first ran the nano-X I got the message:
Unsupported 16 color (4 bpp) truecolor framebuffer
Cannot initialise screen
I check the code and found out that in ./drivers/scr_fb.c function fb_open, there is a need to deal with case 4. so I added the lines:
if(visual == FB_VISUAL_TRUECOLOR || visual == FB_VISUAL_DIRECTCOLOR) {
switch(psd->bpp) {
case 4:
psd->pixtype = MWPF_PALETTE;
break;
After doing that I got the message:
No driver for screen type 1 visual 4 bpp 4
Cannot initialise screen
So I found out that my device has psd->planes == 0 (I do not know what it means), so in ./drivers/fb.c select_fb_subdriver I added:
if(psd->planes == 1 || psd->planes == 0) {
switch(psd->bpp) {
After these two changes nano-X runs with no errors. I ran the sample.c code but I got no output on the display, the log is:
[root@ebr oren]$ ./bin/nano-X & sleep 1 ; ./test/sample
start set cmap !
get cmap option !
0 100 200 300
set cmap ok
start set cmap !
get cmap option !
0 1100 2200 3300
set cmap ok
createfont: (height == 0) found builtin font System (0)
createfont: (height == 0) found builtin font System (0)
My questions are:
1. Are my two changes above correct? Is there a better way to do that?
2. Can someone see what the problem is that the device display nothing on the screen?
Thanks,
Oren.
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