How can I change booting logo image?

Hello @younghan ,
Can you take a look at https://github.com/STMicroelectronics/meta-st-openstlinux/tree/mickledore/recipes-core/psplash ?

You will find different elements that helps you to understand what is necessary for the cross compilation of psplash-drm. 

If you take a more precise look at the Makefile :

SPLASH_IMG ?= OpenSTLinux_background_480x272.png
SPLASH_IMG_ROT ?= OpenSTLinux_background_480x272_rotation.png

all: modeset

generate_header: $(SPLASH_IMG) $(SPLASH_IMG_ROT)
	@gdk-pixbuf-csource --macros $(SPLASH_IMG) > image_header.tmp
	@(sed -e "s/MY_PIXBUF/SPLASH_IMG/g" -e "s/guint8/uint8_t/g" image_header.tmp > image_header.h && rm image_header.tmp)
	@gdk-pixbuf-csource --macros $(SPLASH_IMG_ROT) > image_header.tmp
	@(sed -e "s/MY_PIXBUF/SPLASH_IMG_ROT/g" -e "s/guint8/uint8_t/g" image_header.tmp >> image_header.h && rm image_header.tmp)

psplash:
	$(CC) $(CFLAGS) $(LDFLAGS) -o psplash-drm basic_splash_drm.c -I. `pkg-config --cflags --libs libdrm pixman-1 libpng` -Wall -Os

clean:
	rm -rf psplash-drm

You can see you have a rule to compile the psplash binary, and a one to generate the header. The header is the file called image_header.h in the folder tree. You can also see that you have this file already present by default.

Now if we take a look at the recipe psplash-drm.bb (in the do_compile task):

do_compile() {
 bbnote "EXTRA_OEMAKE=${EXTRA_OEMAKE}"
 oe_runmake clean
 oe_runmake psplash
}

You see that only the psplash rule is compiled, and not the header generation. So I think you will have to change the SPLASH_IMG and SPLASH_IMG_ROT in the Makefile first, then generate the header manually, to finally cross compile the binary.  I do not know if we have limitations with the resolution of the image, you will have to test different ones.

Kind regards,
Erwan.