On Sat, 31 Mar 2007, Mark Glassberg wrote:

> Has anyone succeeded in booting from a usb-storage device.  I partitioned
> mine with a small bootable W98 partition followed by my system on an ext2
> partition.  I've tried to boot using loadlin vmlinuz initrd=initrd.gz
> root=/dev/sda2 ro, but after the usbcore and usb-storage modules load, the
> linuxrc is still not able to mount /dev/sda2.
> 
> Any assistance would be greatly appreciated.

Lots have people have successfully booted from a USB storage device.

It's not enough to load usbcore and usb_storage.  You have to load 
scsi_mod and sd_mod as well.

You also have to realize that usb-storage has by default a 5-second delay 
before it will scan any attached device.  If the system tries to use the 
device too soon it will fail.  You can change the delay length by adding a 
boot-line parameter:

        usb_storage.delay_use=N

where N is the number of seconds.  Many devices will work fine with N set 
to 0.

Alan Stern


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