no /dev/ttyS0 ?

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Hello,

I built a kernel where the serial core and 8250 code will be in a module
and not built in.

But now there is no /dev/ttyS0 after a reboot. only /dev/ttyS1/2/3.
If i mknod it manually it works fine.
in the previous kernel, after a reboot I already had /dev/ttyS0.

Where can I start check for the problem ?
I know udev is making the /dev/ttyS0 but where is the
code in the kernel that is supposed to send the command ?

Thank You
naziir

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