i.MX Processors中的主题 i.mx6 parallel LCD framebuffer question

i.MX Processors中的主题 i.mx6 parallel LCD framebuffer question https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428058#M65018 <HTML><HEAD></HEAD><BODY><P>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</P><P>root@arm:~# cat rgb800480.raw >/dev/fb0</P><P>cat: write error: No space left on device</P><P>root@arm:~#</P><P>Also</P><P>root@arm:~# cat /dev/zero >/dev/fb0</P><P>cat: write error: No space left on device</P><P>root@arm:~#</P><P></P><P>Did I miss anything?</P><P>The parameter pass to kernel is</P><P>optargs="video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB24,bpp=24 consoleblank=0 fbmem=24M vmalloc=400M"</P><P></P><P>Plus, when proforming "fbset" under ubuntu 14.04, I got</P><P>root@arm:~# fbset 800x600-60</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: WARNING: adapt panel end blank lines</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>imx-ipuv3 2400000.ipu: Unsupported burst size 1</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>root@arm:~#</P><P></P><P>Could you help me out? Thanks.@</P></BODY></HTML> Wed, 13 May 2015 10:30:29 GMT eric_lee1 2015-05-13T10:30:29Z i.mx6 parallel LCD framebuffer question https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428058#M65018 <HTML><HEAD></HEAD><BODY><P>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</P><P>root@arm:~# cat rgb800480.raw >/dev/fb0</P><P>cat: write error: No space left on device</P><P>root@arm:~#</P><P>Also</P><P>root@arm:~# cat /dev/zero >/dev/fb0</P><P>cat: write error: No space left on device</P><P>root@arm:~#</P><P></P><P>Did I miss anything?</P><P>The parameter pass to kernel is</P><P>optargs="video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB24,bpp=24 consoleblank=0 fbmem=24M vmalloc=400M"</P><P></P><P>Plus, when proforming "fbset" under ubuntu 14.04, I got</P><P>root@arm:~# fbset 800x600-60</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: WARNING: adapt panel end blank lines</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>imx-ipuv3 2400000.ipu: Unsupported burst size 1</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>imx-ipuv3 2400000.ipu: mxc ipu: unimplemented pixel format</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>mxc_sdc_fb fb.25: cannot get pixel format</P><P>mxc_sdc_fb fb.25: timeout when waiting for flip irq</P><P>root@arm:~#</P><P></P><P>Could you help me out? Thanks.@</P></BODY></HTML> Wed, 13 May 2015 10:30:29 GMT https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428058#M65018 eric_lee1 2015-05-13T10:30:29Z Re: i.mx6 parallel LCD framebuffer question https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428059#M65019 <HTML><HEAD></HEAD><BODY><P>Hi Lee</P><P></P><P>Your setting is correct.</P><P>You should able to <SPAN style="color: #51626f; font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif;">rgb800480.raw content on screen if display bpp and image bpp matches.</SPAN></P><P><SPAN style="color: #51626f; font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif;">dd if=rgb800480.raw  of=/dev/fb0</SPAN></P><P></P><P>You can used following commands to check supported display modes</P><P>cat /sys/class/graphics/fb0/modes</P><P>And you can set using </P><P>echo U:1280x720p-60 > /sys/class/graphics/fb0/mode</P><P></P><P>Thanks</P><P>Saurabh</P></BODY></HTML> Wed, 13 May 2015 11:48:56 GMT https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428059#M65019 saurabh206 2015-05-13T11:48:56Z Re: i.mx6 parallel LCD framebuffer question https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428060#M65020 <HTML><HEAD></HEAD><BODY><P>Hi Saurabh,</P><P>When passing bpp=32 parameter to kernel, I have no problems with that. However, it seems that I can only choose those bpp=32 ones in the /etc/modes to avoid this kind of errors when performing fbset. Does the i.mx6 lcd driver only limit user using 32 bit bpp? How to work around this?</P><P>I meant if you fbset to a mode that bpp is not equal to 32. You will get errors.</P></BODY></HTML> Thu, 14 May 2015 08:03:47 GMT https://community.nxp.com/t5/i-MX-Processors/i-mx6-parallel-LCD-framebuffer-question/m-p/428060#M65020 eric_lee1 2015-05-14T08:03:47Z