How to add custom logo during uboot booting on imx8mplus?

[vivek338]

Hi,

I am working imx8mplus dev board by nxp. Below is configuration for yocto build:-

MACHINE = "imx8mpevk-fastboot"
DISTRO = "fsl-imx-wayland"
DISTRO_VERSION = "6.6-scarthgap"

bitbake imx-image-fastboot

Following document falcon mode fastboot AN14093 version 2.0.

Now I want to display custom logo during uboot booting means before kernel boot. 

During  :-

U-Boot SPL 2024.04+g674440bc73e+p0 (Jun 06 2024 - 10:05:34 +0000)
DDRINFO: start DRAM init
DDRINFO: DRAM rate 4000MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
SEC0: RNG instantiated
Normal Boot
Trying to boot from MMC1

Please guide me how to do this.

I am doing this because i need to on display as soon as power on. Even falcon mode takes 3-4 seconds which i have already implemented but i need less than 2 seconds to show something on display.

Thanks in advance!!

[Zhiming_Liu]

Hello,

Which display interface you are using? LVDS0/1? HDMI? MIPI?

Best Regards,
Zhiming

[vivek338]

Thanks for reply!

Iam using HDMI.

[Zhiming_Liu]

Hello,

There is no HDMI driver in uboot, so it can't display a logo with HDMI.

Best Regards,
Zhiming

[vivek338]

Thanks for replying!

How can i display logo on hdmi under 2-3 seconds, is that possible if yes than how can I achieve it? Falcon mode takes more than 4 seconds to display something on hdmi.

[Zhiming_Liu]

Hello,

It can't display anything if there is no HDMI driver.

Best Regards,
Zhiming

[vivek338]

Hi,
Thanks for the answer !
But is it possible to start display and show something just after uboot? If yes then how?

Or any fastest way to display on hdmi.

[Zhiming_Liu]

Hello,

But is it possible to start display and show something just after uboot? If yes then how?

--> From the beginning of kernel, that's impossible , need to wait display framework initialization.

Best Regards,
Zhiming

[vivek338]

Hi,
Thanks for replying !
So in this case is that possible to display in between 2-3 seconds ? if yes then how to do it?
Iam following falcon mode fastboot AN14093 version 2.0.

[Zhiming_Liu]

Hello,

I don't understand the problem you're talking about, the default kernel displays the penguin icon at startup, other than that it's not possible to implement an earlier logo display.

Best Regards,
Zhiming

[vivek338]

Hi,

I mean to say if falcon mode boot in 2.2 seconds then its possible to display something in between 2-3 seconds. Also penguin logo dosen't display in falcon mode.

[Zhiming_Liu]

Hello,

You can try to add CONFIG_LOGO_LINUX_MONO=y in kernel defconfig

Best Regards,
Zhiming

[vivek338]

Hi,

Is it possible to launc application in between 2-3 seconds, as I see falcon mode boots up board and reaches to login prompt in 10 seconds and systemd starts in 4 seconds.

[Zhiming_Liu]

Hello,

You can use shell script to boot application, don't use systemd , please refer below steps.

Best Regards,
Zhiming

[vivek338]

Hi,

Dont have /etc/init.d

[Zhiming_Liu]

Hello,

You can also refer this  https://stackoverflow.com/questions/40861280/what-is-the-best-way-to-start-a-script-in-boot-time-on-...

Best Regards,
Zhiming