Mount /dev/mmcblk0p1 /mnt - fails

Trying to get /overlay working. I formatted my SD card EXT4 and tried to mount it, but it did not work.

root@openwrt:~# mount /dev/mmcblk0p1 /mnt
mount: mounting /dev/mmcblk0p1 on /mnt failed: Invalid argument
root@openwrt:~# cd /dev
root@openwrt:/dev# ls
bus                 kmsg                mtd1ro              mtd6                network_latency     snd
console             log                 mtd2                mtd6ro              network_throughput  tty
cpu_dma_latency     mem                 mtd2ro              mtdblock0           null                ttyS0
full                memory_bandwidth    mtd3                mtdblock1           port                ttyS1
gpiochip0           mmcblk0             mtd3ro              mtdblock2           ppp                 ttyS2
gpiochip1           mmcblk0p1           mtd4                mtdblock3           ptmx                urandom
gpiochip2           mtd0                mtd4ro              mtdblock4           pts                 watchdog
i2c-0               mtd0ro              mtd5                mtdblock5           random              watchdog0
kmem                mtd1                mtd5ro              mtdblock6           shm                 zero
root@openwrt:/dev# cd /mnt
root@openwrt:/mnt# ls

Think this should work. What's missing?

This looks like you're missing the fs driver.

Is kmod-fs-ext4 installed?

Else provide the messages from dmesg after failed mount command.

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