help me...! Another requirement
John Ellson
ellson at research.att.com
Thu Dec 18 19:19:22 UTC 2008
Magesh,
As I understand it, the BIOS must know how to get the MBR off the boot
device, so that means the BIOS must know how to read a SCSI device.
It does this by means of BIOS extension code from a ROM on the SCSI
interface card.
Similarly, network booting is done with BIOS extension code from a ROM
on the network card.
Init/udev are used later on, after the kernel is running, to rescan all
devices; not just the ones needed for booting.
Automounting usually refers to the NFS process of only mounting a
directory over the network when it is read. That happens later after
the system is fully running. See autofs.
John
magesh wrote:
> so you mean that the basically the init identifies every scsi devices
> (whether it be usb or hard disk)
> Then can you tell me how does it automounts the found scsi devices( as
> in fedora we can see the devices or partitions on the desktop, i mean
> it gets automounted)
> So is it the init is responsible for the automounting or it is the udev??
>
> thankyou
> magesh
>
>
>
> Basically, the bios looks for a MBR on some device, or netboot,
> according to your selected boot priorities.
> The MBR starts grub, or lilo.
> Or the netboot (pxe bios extension, or whatever) gets an IP from
> DHCP and then starts a tftp transfer from a server identified by
> the DHCP server.
>
> AFAIK udev doesn't get involved until after init, at which point
> it might identify additional disks or USB devices.
>
> John
>
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> --
> magesh
> LiFe is "just tryin out things to see if they work"
>
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