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i.mx6 parallel LCD framebuffer question

Question asked by Eric Lee on May 13, 2015
Latest reply on May 14, 2015 by Eric Lee

I am working on i.MX6 custom board. The kernel version is 3.14.28. We use 24-bit parallel RGB LCD interface connecting to a 7-inch 800x480 panel. I can see the pengium picture and console text showing on LCD. The rootfs is ubuntu 14.04. When I try to verify the framebuffer device, I cat a raw image that is used in our standard testing to /dev/fb0. I got

root@arm:~# cat rgb800480.raw >/dev/fb0

cat: write error: No space left on device

root@arm:~#

Also

root@arm:~# cat /dev/zero >/dev/fb0

cat: write error: No space left on device

root@arm:~#

 

Did I miss anything?

The parameter pass to kernel is

optargs="video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB24,bpp=24 consoleblank=0 fbmem=24M vmalloc=400M"

 

Plus, when proforming "fbset" under ubuntu 14.04, I got

root@arm:~# fbset 800x600-60

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: cannot get pixel format

imx-ipuv3 2400000.ipu: WARNING: adapt panel end blank lines

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: cannot get pixel format

imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format

imx-ipuv3 2400000.ipu: Unsupported burst size 1

mxc_sdc_fb fb.25: cannot get pixel format

imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: cannot get pixel format

imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: timeout when waiting for flip irq

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: timeout when waiting for flip irq

mxc_sdc_fb fb.25: cannot get pixel format

mxc_sdc_fb fb.25: timeout when waiting for flip irq

root@arm:~#

 

Could you help me out? Thanks.@

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