No mtd block devices under Linux Kernel 5.17.4 Kirkwood (no replies)

Hi,

Yesterday I upgraded one of my Pogo V4 box to the latest 5.17.4 kernel. When i tried to mount the mtd block devices i received an error, that it does not exists. Looking into the dev list they are indeed missing:

root@server:~# uname -r
5.17.4-kirkwood-tld-1
root@server:~# ls /dev/m*
/dev/mem  /dev/mtd0  /dev/mtd0ro  /dev/mtd1  /dev/mtd1ro

When i downgrade the kernel to 5.15.5 everything works as expected

root@server:~# uname -r
5.15.5-kirkwood-tld-1
root@server:~# ls /dev/m*
/dev/mem  /dev/mtd0  /dev/mtd0ro  /dev/mtd1  /dev/mtd1ro  /dev/mtdblock0  /dev/mtdblock1

I did not try kernel 5.16.5 due to the mentioned USB issues.

What can cause this issue?

The box is on Debian 10:

root@server:~# cat /etc/debian_version 
10.12

Thanks