Can I run linux without a file system?

[Tim Lai]

I am porting linux on a custom board.
I am using the bootrom to load vmlinux onto
RAM, and I am in the middle of getting the console/
serial driver to work.
All the documents I read have refer the console as
/dev/ttyS, and state that to communicate to the
console, I have to set it up with open("/dev/ttyS").

Does that means I have to have some sort of file
system in linux?

Thanks.


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