[SPLASH] enable splash screen to U-boot and Linux on SECO i.MX boards
- U-boot: the logo image is loaded from
mmc 1:1
using the splashsource library. - Kernel: the logo image must be installed in the source before compiling, and the way it's displayed is configured through the
fbcon
kernel command line arg. Seeseco_environment.h
. - Tested on a62 and c12.