How to enable Kernel Splash Screen?

[trongthinh]

My screen size is 1024x600. This is kernel source linux-fslc (branch 4.1-1.0.x-imx) on GitHub that I used. Below are my steps to enable splash screen in kernel:

1. Create an image (logo_custom_clut224.png) which resolution is 1024x600 then export it to ppm extension by using GIMP.

2. Add the line below to "include/linux/linux_logo.h"

extern const struct linux_logo logo_custom_clut224;

3. Add these line to "drivers/video/logo/logo.c"

#ifdef CONFIG_LOGO_CUSTOM_CLUT224
logo = &logo_custom_clut224;
#endif

4. Add a line to Makefile "drivers/video/logo/Makefile"

obj-$(CONFIG_LOGO_CUSTOM_CLUT224) += logo_custom_clut224.o

5. Add these line to Kconfig "drivers/video/logo/Kconfig"

config CONFIG_LOGO_CUSTOM_CLUT224
   bool "Standard 224-color custom logo"
   default n

6. Reconfiguring kernel using menuconfig.

CONFIG_LOGO_CUSTOM_CLUT224=y

7. Rebuild kernel. Built success.

Unfortunately, The splash screen didn't show. Can Anyone give some advice? Is there anything wrong with my picture?

[lshi]

Hi Thinh

I am trying to do the same thing but for android. I followed your steps up until step 6

6. Reconfiguring kernel using menuconfig. CONFIG_LOGO_CUSTOM_CLUT224=y

How to do it?

I tried under "vender/nxp-opensource/kernel"

make menuconfig

But there's nothing loaded under "Device Drivers -> Graphics support -> Bootup logo". If I click "load", there's no file called .config either.

thanks,

[trongthinh]

Hi Lei Shi,

Which android version are you using? Below is an example for android 9.0

there's no file called .config either.

=> in this example do command $make imx_v7_android_defconfig. this step load defaul configuration and create .con file. Remember EXPORT cross compiler before doing config.

[lshi]

Hi Thinh,

Thank you! I am using Android p9. I wonder when/how should I do the "menuconfig": 

make menuconfig

as you did in step6 before building the kernel? 

make KCFLAGS=-mno-android

When I do "make menuconfig", I see nothing under "Device Drivers -> Graphics support -> Bootup logo".

thanks,

Lei

[igorpadykov]

Hi Thinh

one can try with nxp logo patches

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

linux-imx - i.MX Linux kernel 

linux-fslc is community version and supported on meta-fsl-arm mailing list:
https://lists.yoctoproject.org/listinfo/meta-freescale

https://community.nxp.com/message/402940#402940 

Best regards
igor
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[trongthinh]

Hi igorpadykov

Splash screen in bootloader is a good solutions, yet It is too complex for me now. The good solution is to do splash screen in kernel.  I tried rebuild kernel too many times with difference image size. I found that the picture which size is larger than 1000x586 cannot be displayed. I still don't understand why? 

[timgruijters]

Hi Thinh, (and igorpadykov‌?)

Have you been able to solve this problem? It also exists in the NXP Linux 4.9 kernel.

[trongthinh]

Hi Tim,

There is some thing wrong in my export picture; in GIMP. I can't not find what wrong, so I change to ImageMagic.