How does kernel know where to find the root file system?

- P
- Paul Hsu
  
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posted
14 years ago

Fri, Feb 26, 2010 3:26 AM

Dear all,

As I know, the boot up procedure is

Power on
Bootloader( Uboot)
Enter kernel

At step 3, kernel will find and execute the 1st program "init" in the root file system to bring up the whole system

My question is how does kernel know where to find the root file system?

Root file system maybe in NAND, NOR, or get from NFS.

But how does kernel know that?

BR, Paul

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- A
- Alex A. Mihaylov
  
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posted
14 years ago

Fri, Feb 26, 2010 7:17 AM

root=/dev/where_you_root as kernel command line =)

root=nfs ip=... in case NFS root, root=/dev/mtdbllockN in other cases. root=/dev/mmcblockN in case root on mmc card. So simple.

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