Boot linux 2.6.18 from a USB drive
I'm having some trouble on booting a 2.6.18 kernel from a usb drive. By searching the topic in the Internet, I think I understand the issue with booting linux from a usb drive. Basically the scsi bus needs to be rescanned in order to detect the disk and mount it as a scsi disk.
Martyn Honeyford has an article "Boot Linux from a FireWire device" well explaining the issue and suggesting some solutions. However the article is quite old, talking about 2.4 kernel. He has the following script to force a scsi scan in the initrd.
echo "scsi add-single-device 0 0 0" > /proc/scsi/scsi
echo "scsi add-single-device 1 0 0" > /proc/scsi/scsi
echo "scsi add-single-device 2 0 0" > /proc/scsi/scsi
/bin/devfsd /dev -np
The newer 2.6 kernel obsoleted the devfs and the devfsd is no longer existent. Anybody know(s) how to force a scsi scan in a 2.6 kernel?
Thanks a lot,
All you should have to do in your initrd boot scripts is simply wait a few seconds before attempting to mount the USB device after the modules load and udev kicks in.
So the newer 2.6.18 kernel actually does a scsi scan automatically? When does udev kick in?
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