Kernel 4.9.44 ignores rootfstype=ext4 and tries only squashfs,jffs2 for rootfs

Hi @all,

My board has an 8GB eMMC Flash storage. One partition is formatted with ext4 and contains the lede rootfs.

I boot the kernel with the parameters root=/dev/mmcblk0p2 rootfstype=ext4 and got a panic when rootfs should be mounted.

    No filesystem could mount root, tried: squashfs jffs2

I have set CONFIG_EXT4_FS=y, and has disabled squashfs, ubifs and so on via menuconfig.
The kernel only tries squashfs and jffs2 but ext4 is fully ignored.

Any idea what is ging wrong here?

Extroot, overlay, pivot_overlay ... are no options.