[Buildroot] Raspberry + Usb to TTL Serial Cable issue

[Sylvain LG]

Hello,

I try to use a  Usb to TTL Serial Cable with a Raspberry Pi running the
default system built by Buildroot.
This cable fully works with a Raspbian system, but on the Buidroot one, it
only displays The first line and nothing else:

Uncompressing Linux... done, booting the kernel.

Kernel is configured with thoses options:

>  --- USB Serial Converter support
> [*]   USB Serial Console device support
> [*]   USB Generic Serial Driver


What is still missing?


Thank you,

Sylvain
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