On Tue, 14 Mar 2006, Ken Cobler wrote:
> Stephen Liu wrote:
>
> >Hi folks,
> >
> >Would it be possible installing USB pendrive as Hard drive, running
> >Grub to boot?
> >
> >I have been trying couple days making DSL 2.2b running on a pendrive as
> >a Hard drive using Grub to boot the device without success.
> >
> >The motherboard supports USB-ZIP/USB-HDD/USB-FDD/SCSI/etc.booting. The
> >pendrive can be booted if install DSL on it as USB-ZIP running syslinux
> >as booting device but never work as USB-HDD. It also did not work
> >using grub to boot. I also tried booting SCSI option as a USB 2.0 PCI
> >Controller has been installed.
> >
> >Advice and/or links would be appreciated. TIA
> >
> >B.R.
> >Stephen Liu
> >
> I have configured a 256M USB hard drive as a bootable device, loaded a basic
> linux 2.6 OS and able to get it to boot. I use the device as a loader to
> configure computers that have no image on their hard drive.
>
> Here is the link that helped me out the most.
> http://forums.gentoo.org/viewtopic.php?p=2384956#2384956
>
>
> The biggest issue with USB device is that to Linux it appears as a SCSI
> device. You can get into a catch-22 situation where the device will boot to
> get the image, but cannot mount the root filesystem even though the SCSI
> driver is installed in the image.
It looks like there are two key issues:
1. You have to have entries in your initrd's filesystem for /dev/sda
and /dev/sda1. Otherwise you won't have any way to access the USB
device.
2. You have to allow time for the USB and SCSI stacks to recognize
the pendrive. 5 seconds is minimal, 10 seconds should be plenty.
Alan Stern
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