Questions regarding console drivers..

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Hi all,
I have gone through the kernel/kernel/printk.c file. And i have the following questions..
I have some rough idea of several things, but i need to conform them
 
1) What is a console driver? --> My idea is it allows the kernel to input or output the characters
                                              to or from a particular device.
2) Why so many command-line consoles are needed? --> (if first qn is right...why cant u use single
                                               console to several devices)
3) What is a boot console & real console?
 
4) How to know how many number of consoles are running at a time?
 
5) In the boot command line we will pass one console name "console=ttyXXX",
other than that where the remaining consoles are being registered?
 
Please answer these questions so that i can have furthur understanding

Thank you all..
--
With regards,
Sandeep Kumar Anantapalli,

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