Hello everyone,
I got some issues with fb2.
Step 1: Show ring buffer infomation about mxc
dmesg | grep mxc_sdc
output:
mxc_sdc_fb mxc_sdc_fb.0: register mxc display driver lcd
mxc_sdc_fb mxc_sdc_fb.1: register mxc display driver hdmi
mxc_sdc_fb mxc_sdc_fb.2: register mxc display driver ldb
mxc_sdc_fb mxc_sdc_fb.3: register mxc display driver ldb
that mean hdmi is port is mapped to frame buffer 1
Step 2: Show frame buffer infor
cat /sys/class/graphics/fb1/modes
Output:
U:240x320p-60
Maybe, it's strange
I also checkout fb2 mode
cat /sys/class/graphics/fb2/modes
Output:
V:1280x1024p-60
V:1024x768p-60
U:1280x720p-120
U:1280x720p-100
U:1920x1080p-30
U:1920x1080p-25
U:1920x1080p-24
U:1920x1080p-50
U:1440x576p-50
U:1440x576p-50
U:1440x288p-50
U:1440x288p-50
U:1280x720p-50
U:720x576p-50
U:720x576p-50
U:1920x1080p-60
U:1440x480p-60
U:1440x480p-60
U:1440x240p-60
U:1440x240p-60
U:1280x720p-60
U:720x480p-60
U:720x480p-60
U:640x480p-60
I guess fb2 is frame buffer for hdmi port
Step 3: I rebuild fb-test app to test frame buffer
fb 0 worked well. We can display image on LCD and DVI port at the same time.(DVI and LCD use IPU1_DISP0)
fb 1 or 2 did not work. No thing displayed on screen
Test procedure
export DISPLAY=:2 //(or 0,1) export fb to user space ???
echo 0>/sys/class/graphics/fb2/blank //unblank screen
./fb-test 2 //run test application with fb2
My system
uname -a
Linux devel 3.0.35 #805 SMP Thu Apr 24 17:12:39 IDT 2014 armv7l GNU/Linux
what's is wrong in here?
Thank all,
Thaidao
