topic Re: iMX6 solo LCD off based on Android 4.3 in i.MX Processors

iMX6 solo LCD off based on Android 4.3

siwoolee — Thu, 05 Jan 2017 08:35:28 GMT

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

Re: iMX6 solo LCD off based on Android 4.3

igorpadykov — Fri, 06 Jan 2017 09:24:31 GMT

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 LVDS)

Best regards
igor
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Re: iMX6 solo LCD off based on Android 4.3

siwoolee — Mon, 09 Jan 2017 06:37:01 GMT

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...