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Notes on cmdline
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The cmdline determines a good bunch of things, such as finding the initrd and where console output goes.
Those are crucial to understand to avoid blank screens and frustration. Try asking a search engine or forum "why is my screen blank" - it is hard to figure out.
console=ttyS0 is common, though some platforms, e.g. som Arm based ones, may require a driver specific tty, such as ttyAMA0.