i.MX ProcessorsのトピックRe: U-boot Logo Splash Display

U-boot Logo Splash Display

davidzhou — Mon, 29 Jan 2018 19:11:18 GMT

Hi,

I have an imx6ul development board.

I have managed displaying customized LOGO Splash on LCD through u-boot (drivers\video\cfb_console.c) .

I found that the image is faded during the kernel loading and goes to totally black during the LCD driver in the kernel re-initializing.

I am not sure is there a way to prove that, such as delayed kernel LCD loading, disable re-initialization totally, combining kernel LCD driver with u-boot LCD driver, etc.

Can someone give me some suggestions what is a better way to prove it?

Thank you,

David Zhou

Re: U-boot Logo Splash Display

igorpadykov — Mon, 29 Jan 2018 23:24:14 GMT

Hi David

please look at 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: U-boot Logo Splash Display

davidzhou — Tue, 30 Jan 2018 13:54:14 GMT

Thank you, Igor.

David

Re: U-boot Logo Splash Display

davidzhou — Mon, 05 Feb 2018 22:02:31 GMT

Hi Igor,

I started to modify the U-boot and Kernel for the logo display.

But first thing is the LOGO display fades to white screen as soon as the U-boot calls

boot_jump_linux()

and transferring control to kernel. (Starting Kernel…)

I don’t see any code patch for U-boot to keep the logo displayed. If the display starts fading when control handles over to kernel, doesn’t matter to make kernel LCD driver as late init nad uses Uboot LCD. Did I miss something?

Or I am using a different version of uboot LCD driver code?

Thank you,

David Zhou

Re: U-boot Logo Splash Display

igorpadykov — Mon, 05 Feb 2018 22:52:29 GMT

Hi David

could you try with nxp uboot/linux releases described on

https://www.nxp.com/support/developer-resources/run-time-software/i.mx-developer-resources/i.mx-6series-i.mx-7series-software-and-development-tool-resources:IMX_SW

Re: U-boot Logo Splash Display

davidzhou — Wed, 07 Feb 2018 22:11:50 GMT

HI Igor,

I figured out that the LCD display is turned-off in the arch_preboot_os before transferring the control to kernel.

Thank you,

David Zhou

Re: U-boot Logo Splash Display

circum — Tue, 20 Feb 2018 20:59:06 GMT

Hi David, Igor,

This issue affects me, too.

Does it mean that you did not find a solution to this problem? It means that it is not possible to display an optimal quality splash screen during the total boot process of the imx6 colibri? I.e., there will be a small gap while the lcd is not refreshed and fades to white?

Regards,

Ferenc

Re: U-boot Logo Splash Display

davidzhou — Wed, 21 Feb 2018 14:04:48 GMT

Hi Igor, Ferenc,

I moved splash logo into Uboot, so it displays about 1 sec. I made changes to kernel LCD driver not be loaded during initialization. It is loaded until it is enabled by a user space driver, which is called by application.

It seems to be working. More tests is needed.

Regards,

David Zhou

Re: U-boot Logo Splash Display

dtran11 — Thu, 23 Apr 2020 17:03:50 GMT

I also see a blip on the display when transitioning uboot to kernel. I use the same image for both splash logo. Did you confirm that the solution is to not reinitialize the display module in the kernel? thanks