C0302 HDMI to VGA support for IMx6-Sabresd board with linux-3.0.35 kernel.

[narasimhuluorug]

Dear Sir/Madam,

Can any one tested attached HDMI to VGA supported module with IMx6 Sbresd board with 3.0.35 kernel or other. If so any can help me out to interface this to the sabre board. Your inputs are highly appreciated.

Thanks & Regards,

Narasimhulu.O

[igorpadykov]

Hi Narasimhulu

seems it can be connected to hdmi port of processor as usual hdmi

panel. However specs of this device are needed for providing more detailed answer.

Best regards

igor

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[narasimhuluorug]

HI Igor,

Thanks for reply actually i have an converter module of HDMI to VGA which is connecting from sabredsd imx6 board to dell desktop monitor VGA. But am not able to display anything on monitor.

Thanks & Regards,

Narasimhulu

[igorpadykov]

Hi Narasimhulu

you should check datasheet of this device for its resolution,

then use appropriate kernel boot parameter like

video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24

Best regards

igor

[narasimhuluorug]

Hi Igor,

I am passing resolution on my bootloader is hdmi_res=1280x1024M@60. The below is kernel log.

mxc_hdmi mxc_hdmi: Read EDID again

mxc_hdmi mxc_hdmi: No modes read from edid

mxc_hdmi mxc_hdmi: create default modelist

fbcvt: 1280x1024@60: CVT Name - 1.310M4

imx-ipuv3 imx-ipuv3.0: WARNING: adapt panel end blank lines

root@SabreSD-iMX6:~ echo 1 > /sys/class/graphics/fb0/blank

root@SabreSD-iMX6:~ echo 1 > /sys/class/graphics/fb1/blank

root@SabreSD-iMX6:~ mxc_hdmi mxc_hdmi: Read EDID again

mxc_hdmi mxc_hdmi: No modes read from edid

mxc_hdmi mxc_hdmi: create default modelist

Best Regards,

Narasimha

[igorpadykov]

Hi Narasimhulu

one can try the fbset command, like

fbset -fb /dev/fb0 -xres 1440 -yres 540

Best regards

igor

[narasimhuluorug]

Hi Igor,

Thanks for the reply. Is there any module which already has tested HDMI to VGA converters before with sabreSD. If so you can suggest accordingly.

Thanks & Regards,

Narasimha

[igorpadykov]

Hi Narasimhulu

unfortunately I am not aware of such modules

Best regards

igor

[narasimhuluorug]

Hi Igor,

Here i found the datasheet for the module HDMI to VGA. Inside the module having CH7101B chip module. Please find the given link for datasheet.

http://www.chrontel.com/media/Datasheets/CH7101B%20Brief%20Datasheet%20Rev1.0.pdf

Thanks & Regards,

Narasimha

[igorpadykov]

Hi Narasimhulu

suggest to check with standard hdmi panel, if it works

then this device should work too. If not, one can post issue on

Plugable Launches the HDMI to VGA Adapter Cable | Plugable

Best regards

igor

[narasimhuluorug]

Hello Igor,

Can you please check the data-sheet once and can guide where exactly am unable to display using this module on vga display. Is there any hardware compatibility or property to support this kind of external modules to the Imx6 processor. Can you please clear these queries.

Can please give any solution for above points to clear understanding.

Thanks & Regards,

Narasimha

[Rodrigue]

Hi Narasimhulu,

It is impossible to give you details based on the spec you send. electrical characteristics are here key.

It may not work just because your HDMI to VGA converter does not match the electrical specs (current).

So please measure the 5V on the HDMI side as it supplies the converter.

br,

Rod

[narasimhuluorug]

Hello Igor,

Can you please check the data-sheet once and can guide where exactly am unable to display using this module on vga display. Is there any hardware compatibility or property to support this kind of external modules to the Imx6 processor. Can you please clear these queries.

Thanks & Regards,

Narasimha

[narasimhuluorug]

Hello Igor,

Thank you very much for sharing the information.

Thanks & Regards,

Narasimha

[narasimhuluorug]

Hello Igor,

Can you please check the data-sheet once and can guide where exactly am unable to display using this module on vga display. Is there any hardware compatibility or property to support this kind of external modules to the Imx6 processor. Can you please clear these queries.

Thanks & Regards,

Narasimha

[narasimhuluorug]

Hi Igor,

Waiting for you valuable reply.

Best Regards,

Narasimha

[narasimhuluorug]

Hi Igor,

Thanks for the reply. But what is the below logs will giving the information, anything is wrong in this case. Where exactly can trace for this, as the module is plug and play and there is no any technical datasheet for this module. I am using Barebox bootloader. If you can provide the any solution it will very useful to me.

mxc_hdmi mxc_hdmi: Read EDID again

mxc_hdmi mxc_hdmi: No modes read from edid

mxc_hdmi mxc_hdmi: create default modelist

fbcvt: Aspect ratio not CVT standard

fbcvt: 1360x768@60: CVT Name - Not a CVT standard - 1.044 Mega Pixel Image

Thanks & Regards,

Narasimha