Problem with the framebuffer on an ARM device

ilpaso

Hi all,
I installed Qt Embedded on a ARM device with linux.
There is a problem with the framebuffer.
Running a simple application (./application -qws) it returns:
@Cannot create semaphore /tmp/qtembedded-0/QtEmbedded-0 'd'
Error 38 Function not implemented
Cannot get display lock
Aborted@

but when I try to run the framebuffer example application it returns

@The framebuffer device was opened successfully.

Fixed screen info:
id: imapfb
smem_start: 0x44800000
smem_len: 4718592
type: 0
type_aux: 0
visual: 2
xpanstep: 0
ypanstep: 1
ywrapstep: 0
line_length: 2048
mmio_start: 0x20cd0000
mmio_len: 16384
accel: 0

The framebuffer device was mapped to memory successfully.

Successfully switched to graphics mode.

Variable screen info:
xres: 1024
yres: 576
xres_virtual: 1024
yres_virtual: 1152
yoffset: 0
xoffset: 0
bits_per_pixel: 16
grayscale: 0
red: offset: 11, length: 5, msb_right: 0
green: offset: 5, length: 6, msb_right: 0
blue: offset: 0, length: 5, msb_right: 0
transp: offset: 0, length: 0, msb_right: 0
nonstd: 0
activate: 0
height: 0
width: 0
accel_flags: 0x0
pixclock: 46213560
left_margin: 128
right_margin: 15
upper_margin: 21
lower_margin: 5
hsync_len: 104
vsync_len: 4
sync: 0
vmode: 0

Frame Buffer Performance test...
Average: 39244 usecs
Bandwidth: 114.667 MByte/Sec
Max. FPS: 25.482 fps

Will draw 3 rectangles on the screen,
they should be colored red, green and blue (in that order).
Done.@

How can I solve?
I changed the permission to the file /tmp/qtembedded-0/QtEmbedded-0 but it returns a "wrong permissions" error

Thank you in advance for your help. I spent the last 3 days around this problem

ilpaso

ngrosjean

When you launch the framebuffer example, did you have the three rectangle on the screen?
Have you write permission on your partition including the /tmp directory? Perhaps this partition is read-only? What the result of "mount" command?

ilpaso

Thank you very much ngrosjean for you replay.
I'm very disperate!

When I launch the framebuffer example there are the three rectangles on the screen in the right order and the output is written in my previous post.
I tried to change the permissions on /tmp directory. /tmp is a link to /var/tmp so I changed the permission on /tmp/var.
When I try to run another example after changed the permission the system returns a "wrong permissions" error.
This evening I'll try the mount command and I'll post a replay.

Thank you again

ilpaso

stas2

I have recently had the same problem. Turned out that I had to include System V IPC option in the kernel.