Fabian,
I've just tested the new 4.4.14 kernel version and I'm still having boot problems, I can only see the colored screen.
This is the list of files in the '/boot' filesystem after upgrading from 4.1.9-v7 using 'rpm -Uvh' instead of 'yum update'. Please compare with yours and let me know any discrepancies:
# l total 39920 -rwxr-xr-x. 1 mikaku users 17932 Jul 6 12:45 bootcode.bin -rwxr-xr-x. 1 mikaku users 112 Jun 7 08:24 cmdline.txt -rwxr-xr-x. 1 mikaku users 276 Mar 15 15:32 config.txt -rwxr-xr-x. 1 mikaku users 18693 Jul 4 12:14 COPYING.linux -rwxr-xr-x. 1 mikaku users 2504 Jul 6 12:45 fixup_cd.dat -rwxr-xr-x. 1 mikaku users 6480 Jul 6 12:45 fixup.dat -rwxr-xr-x. 1 mikaku users 9719 Jul 6 12:45 fixup_db.dat -rwxr-xr-x. 1 mikaku users 9713 Jul 6 12:45 fixup_x.dat drwx------. 2 mikaku users 8192 Jun 6 17:03 grub -rwxr-xr-x. 1 mikaku users 19854145 Dec 31 1979 initramfs-4.4.14-v7.2.20160704gite98827a.el7.img -rwxr-xr-x. 1 mikaku users 4340176 Jul 11 15:46 kernel-4.4.14-v7.2.20160704gite98827a.el7.img -rwxr-xr-x. 1 mikaku users 4340176 Dec 31 1979 kernel7.img -rwxr-xr-x. 1 mikaku users 1494 Jul 6 12:45 LICENCE.broadcom drwx------. 2 mikaku users 16384 Dec 31 1979 overlays -rwxr-xr-x. 1 mikaku users 618296 Jul 6 12:45 start_cd.elf -rwxr-xr-x. 1 mikaku users 4927256 Jul 6 12:45 start_db.elf -rwxr-xr-x. 1 mikaku users 2747544 Jul 6 12:45 start.elf -rwxr-xr-x. 1 mikaku users 3878712 Jul 6 12:45 start_x.elf
Before the upgrade there was the file 'initrd-plymouth.img' but it looks like now is missing, I guess this was part of the upgrade process. Some files also have changed a little their size.
# cat cmdline.txt dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4 elevator=deadline rootwait ipv6_disable=1
# cat config.txt #uncomment to overclock the arm. 700 MHz is the default. arm_freq=700# NOOBS Auto-generated Settings: hdmi_force_hotplug=1 config_hdmi_boost=4 overscan_left=24 overscan_right=24 overscan_top=16 overscan_bottom=16 disable_overscan=0 core_freq=250 sdram_freq=400 over_voltage=0
Thanks.