No boot logo in recent 4.19 stable kernels
I have updated my kernel from 4.19.72 to 4.19.84 and with that change, there isn't a boot logo anymore. Neither the penguin nor a patched-in actual logo. Later in the boot process when user space starts using the display, there is the expected content visible.
I bisected the two versions and that marked e352d8eb9394af1897cfeaaafe8fd946269f6637 as the commit that introduced this.
I'm using an i.MX6 SoloX with this panel: https://github.com/Tragetaschen/linux-stable-pconxs/blob/linux-p868-4.19.y/drivers/gpu/drm/panel/panel-ortustech-com32h3n89ulc.c and this device tree: https://github.com/Tragetaschen/linux-stable-pconxs/blob/linux-p868-4.19.y/arch/arm/boot/dts/imx6sx-p868.dts
Thanks, Kai