No splash screen was shown on the display, but only the console. I checked if some error occurred, and using
dmesg | grep logo
i noticed the following: fbcon_init: disable boot-logo (boot-logo bigger than screen). I checked in kernel source code and it was generated in drivers/video/fbdev/core/fbcon.c in fbcon_prepare_logo function. Now, printig variables value, i noticed that logo_height is 1080 which is correct because the logo is 1920x1080, vc->vc_font.height is 16, logo_lines in this way is 68, but vc->vc_bottom is only 67.
To workaround this problem i set the value of vc->vc_bottom to 68 at the beginning of the function, and in this way i can see the kernel splash screen logo at startup. Is there a better solution to solve this problem?
Second problem:
when booting the module, the console messages are shown above the kernel splash screen logo. if i disabled printk in kernel config obviously there are no messages over the logo, but there is a blinking cursor on the top left corner of the screen. Following your guide it seems that i need to add the vt.global_cursor_default=0 to the boot arguments. Here is the printenv of my u-boot, and i tried to do the following setenv mmcargs 'setenv bootargs vt.global_cursor_default=0 console=${console},${baudrate} root=${mmcroot} video=imxdpufb5:off video=imxdpufb6:off video=imxdpufb7:off' but it didn’t work. How can i remove the console messages from the kernel splash screen? If this could help, here you can find the kernel config.
To workaround this problem i set the value of vc->vc_bottom to 68 at the beginning of the function, and in this way i can see the kernel splash screen logo at startup. Is there a better solution to solve this problem?
This seems to be a correct solution. The other workaround is too choose a splash screen image with smaller resolution.
How can i remove the console messages from the kernel splash screen?
Did you disable the Kernel messages as explained here?
Did you disable the Kernel messages as explained here?
Yes, i’ve tried doing the following: setenv mmcargs 'setenv bootargs vt.global_cursor_default=0 console=${console},${baudrate} root=${mmcroot} video=imxdpufb5:off video=imxdpufb6:off video=imxdpufb7:off quiet' but it didn’t work.
there wasn’t defargs variable in u-boot, so i set mmcargs.
Looks like I partially solved the issue. To actually set vt.global_cursor_default=0 and quiet as boot arguments i changed the boot script (boot.scr) as shown here.
However in this way i’m still getting the first kernel messages on the screen (the first messages shown on the console after “Starting kernel …”). The only way to remove them is to disable printk from the kernel configuration.
If you find a solution that removes all kernel messages from the screen without disabling printk, please, let me know.
