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By default Linux kernel logo will be disabled after about 10min. Meaning the screen gets blank. This holds also for custom kernel logos.

In order to keep the logo being displayed, you can pass consoleblank=0 kernel command line during boot (from U-Boot command line prompt):

# setenv std_bootarg consoleblank=0; saveenv

Or during runtime (e.g. with a script in /etc/init.d) disable console blanking via:

# echo -e "\033[9;0]" >/dev/tty0

Console blanking can also be enabled/disabled accessing the display settings in sysfs:

# echo 0|1> /sys/devices/platform/mxc_sdc_fb.X/graphics/fbX/blank

where 0 is used to unblank and 1 to blank the screen and X is the display index.
see ESP documentation chapter 9.17.3 Devices->Multimedia support-> Console codes
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