Hi Joan,
Attachment "Pixelclock of 6ULL & Panel screen" is the video file about situation of 6ULL occur no output RGB888.
The left side of the video is an oscilloscope, which shows a 6ULL RGB888 Pixel_clock signal, and the right side of the video is our Panel screen. Due to the lens, the picture analysis is not very clear, but the key points of the picture can still be seen.
1. Start watching from 0:00, when it is turned on. Pixel_clock is in normal output state.
2. At 0:08, press Reset, Pixel_clock can be clearly seen to change to L, and then release Reset.
3. At 0:10, you can see that the Pixel_clock starts to vibrate again, and the customer's logo appears on the screen on the Panel. At this time, it is the U-boot screen, which is changed by NXP's logo to the customer's logo.
4. At 0:49, press Reset, Pixel_clock can be clearly seen to change to L, and then release Reset.
5. At 0:51, it can be seen that the Pixel_clock is kept at H, there is no picture on the Panel, only the backlight is on → the picture of U-boot does not appear.
Attachment "Debug message" is the debug message about last 2 times situation of 6ULL turn on.
The last boot is 6ULL no output RGB888 signal.
The following picture is our timing of lcd panel which is setted according to panel spec.
In the normal status, the 6ULL can normally output RGB888 signal. The pixel clock signal is as following.
We think the issue on the imx6ull evk board is different from the issue of 6ULL randomly no output RGB888 signal. So we focus on solving issue of 6ULL randomly no output RGB888 signal now.
Thanks!
Kevin
