GRUB question

On Mon, 28 Jan 2013 06:10:36 +0800, horseriver said:

On Mon, Jan 28, 2013 at 12:05:35PM +0530, Mandeep Sandhu wrote:

quoted

On Mon, Jan 28, 2013 at 2:07 AM, horseriver [off-list ref] wrote:

quoted

hi:)

  Is /boot/initrd.img a root filesystem? what is the filetype of it?

Yes, it's a rootfs with minimal stuff needed for booting a workable
system. why does this matter. doing 'file /boot/initrd.img....' on my
system shows its a gzip compressed file.

quoted

  Can I put initrd.img in a floppy to boot system ?

I think you can. Provided you have the floppy driver compiled into your kernel.

And assuming the initrd fits on a floppy (which is actually unlikely - even
without any kernel modules on it, the initrd to get LVM launched comes in
at around 8M.  A default Fedora initramfs is closer to 20M.  Good luck fitting
that on a floppy :)

Of course, an initrd on floppy is kind of silly, because you still need to
find someplace else to fit the actual kernel - which hasn't fit on a floppy
for quite some time.

  Thanks!

  Does this /boot/initrd.img file come out when building kernel ?
  how to build it?

Your system should have either 'mkinitrd' or 'dracut' to build the
initrd image. Some older systems will have 'mkinitramfs'.
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Of course, an initrd on floppy is kind of silly, because you still need to
find someplace else to fit the actual kernel - which hasn't fit on a floppy
for quite some time.

  
  Do  we must  need initrd.img  to boot system ?

quoted

  Does this /boot/initrd.img file come out when building kernel ?
  how to build it?

Your system should have either 'mkinitrd' or 'dracut' to build the
initrd image. Some older systems will have 'mkinitramfs'.

  I know how to make a initrd image file , but put what data into it?


Thanks!