iMX6 solo LCD off based on Android 4.3

[siwoolee]

Hi.

A custom i.MX6 solo board based on android 4.3 (freescale BSP) works a little good with parallel LCD.

The LCD screen turns on while the part of u-boot and kernel are running.  so I can confirm u-boot splash screen and kernel logo.

but after log message "run_init_process /init" in kernel part from terminal, Suddenly a LCD screen is black. I already checked some hw part - backlight, LCD clcok, etc - they are ok. but LCD data line(RGB) never send anything.

I find a strange message on the logcat:

D/SurfaceControl( 1215): Excessive delay in unblankDisplay() while turning screen on: 18771ms

I attached a logcat file.

please, give me any advice.

Original Attachment has been moved to: logcat.txt.zip

[igorpadykov]

Hi siwoo

please check latest uboot logo patches

Patch to support uboot logo keep from uboot to kernel for NXP Linux and Android BSP (HDMI, LCD and L... 

Best regards
igor
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[siwoolee]

thank you for your advice.

Under the current situation, a u-boot splash screen is keeping until kernel boot up correctly. but a screen gets to black after /init starts. For test, I intentionally add infinite loop code before call /init. As a result of test, a screen is keeping splash image correctly.

and I did to add the only kernel patch code. but a situation is same.

Which part makes this problem either kernel or android platform(start /init)?

I've been in black hole for 10 days. please help me...