uboot logo

[jiejia]

board: imx6q_sabresd;

version: u-boot-2009.08;

patch:0001-Enable-uboot-logo-for-HDMI-LCD-and-LVDS.patch

Dear,

     I want to show logo on my 1280x1024 lcd panel. I have a DVI2RGB board connect to hdmi of mx6q_sabresd. The image shows ok after booting kernel. Now, I need to show logo when system start up. But I found a strange problem when I patch the0001-Enable-uboot-logo-for-HDMI-LCD-and-LVDS.patch to u-boot-2009.08.   HSYNC is always low and DE is not stable. what's the diference between the uboot patch and the kernel?

[igorpadykov · Accepted solution]

Hi jie

reason may be wrong handling hot plug detect bit HDMI_PHY_HPD .

In general  "True" HDMI display with special HDMI cable should be used, as

in addition to DVI signals HDMI provides control lines (I2C) for configuring,

audio, hot plugging. Description about kernel and uboot differencies can be found in

https://community.freescale.com/thread/379601

http://boundarydevices.com/dvi-support-on-i-mx6-boards

Best regards

igor

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