[Gumstix-users] Sony Acx705akm LCD display

[Peter L. <pl...@gm...>]

Hi,

I'm trying to get my Sony Acx705akm display running and got the
test program from:

http://docwiki.gumstix.org/Display#Setting_up_the_Sony_ACX705AKM_on_gumstix

My .config for the linux kernel has:

CONFIG_FB_PXA=m
# CONFIG_FB_PXA_ALPS_CDOLLAR is not set
# CONFIG_FB_PXA_SHARP_LQ043_PSP is not set
CONFIG_FB_PXA_SAMSUNG_LTE430WQ_F0C=y
CONFIG_FB_PXA_PARAMETERS=y

so I think the PXA FB stuff is in the build and should be able to handle
the Sony display despite the Samsung being configured.

In U-boot's bootargs, I have:

video=pxafb:mode:240x160-16,active,hsynclen:7,right:16,left:5,upper:19,low
er:19,vsynclen:2,hsync:1,vsync:1,pixclockpol:0,pixclock:216363

and I do:

mknod /dev/fb0 c 29 0
chmod a+rw /dev/fb0

modprobe pxafb

I compile the test program from the Web page and do:

ppmv_sony692 sony_penguin.ppm

The code displays the expected message:

Mapping SCREENSIZE:
76800
 done

width = 240, height =
160
 done

which seems to indicate that the device was opened
correctly and the image was written to the frame buffer.

However, my screen shows nothing.

What steps am I missing and how do I go about diagnosing
what's wrong?

Thanks for all help.