Comment 6 for bug 1847596

If I don't add dtoverlay=vc4-fkms-v3d in the config.txt, the rpi4 board will have the same corrupted screen as the #1 for armhf kernel + armhf uboot.

On the rpi3 B+ board, if booting with the same uboot without dtoverlay=vc4-fkms-v3d + 4.15/5.0 raspi2 kernel, the hdmi display doesn't have this issue, it proves that the eoan kernel for raspi2 introduces a new issue, will find the root cause for this new issue.