How can bpp=8 be supported in i.MX 6 solo processor?

[jinming]

Currently, I am using LTIB L3.0.35_4.1.0_130816_source.tar based on Linux 3.0.35 and expecting to use bpp=8 via HDMI available on the board (i.MX6 processor). The following u-boot parameters are configured.

      setenv bootargs console=ttymxc0,115200 nosmp video=mxcfb0:dev=hdmi,640x480M@60,bpp=8

      But the linux kernel reports the following information:

      mxc_sdc_fb mxc_sdc_fb.0: cannot get pixel format

      mxc_sdc_fb mxc_sdc_fb.0: cannot get pixel format

      mxc_sdc_fb mxc_sdc_fb.0: cannot get pixel format

       imx-ipuv3 imx-ipuv3.0: mxc ipu: unimplemented pixel format

       imx-ipuv3 imx-ipuv3.0: Unsupported burst size 1

       mxc_sdc_fb mxc_sdc_fb.0: cannot get pixel format (output from drivers\video\mxc\mxc_ipuv3_fb.c)

       imx-ipuv3 imx-ipuv3.0: mxc ipu: unimplemented pixel format

      It seems that 8bpp pixel format is not supported by the IPUv3 framebuffer currently. Please help me on how to support bpp =8 in it? Is there any patch available for supporting bpp=8?

      Thanks a lot!

[YixingKong]

Jin

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

[YixingKong]

Jin

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing

[joanxie]

Yes, as I mentioned in the SR, current bsp couldn't support this. if one want to support his, should change the software by customer/

[qiang_li-mpu_se]

8 bpp was not supported in iMX6 frame buffer driver, I think you can set the frame buffer to 16bpp, then fill the framebuffer with your application in 8 bpp. Then let IPU display IDMAC use generic mode to transfer the data. There is no such patch, you should implement it by yourself.

But for HDMI, I think it can't support 8 bpp.