Theoretical Question--Mounting Root at Boot

Hi,

I'm a mid-level noob, and I'm trying to better understand the bootup
process. I learned rdev tells your kernel where to find the root
filesystem. So the kernel must mount that filesystem on / (how does the
kernel know what mount options to use here?). After mounting the root
fs, Linux can now access /etc/fstab. So why does fstab need a line for
how to mount root, if the kernel somehow already mounted root
successfully?

--
Linux A. Wannabe PizzaPie
.

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