Greetings,

I have a USB pen drive that I can mount it on /dev/sda1, and I would
like to boot from it. 

I'm trying to use the GRUB and I already mapped my usb device with hd1
on /boot/grub/device.map:

(fd0)     /dev/fd0
(hd0)     /dev/hda
(hd1)     /dev/sda <---- HERE!

However, even I have access to the USB device from grub shell on my
system, at boot I can't map to the USB storage to hd1!!

root (hd1,0)
21 : Selected disk does not exist
This error is returned if the device part of a device- or full file name
refers to a disk or BIOS device that is not present or not recognized by
the BIOS in the system.

**
I'm thinking that if the USB module isn't loaded then the USB device is
also unavailable! So, how can we boot from a flash device?

BTW, my board is USB bootable but the GRUB isn't loaded by the USB flash
rather is loaded by hard drive. I already configured the boot order in
the BIOS. Isn't possible to boot from USB flash device?

thanks,
Pedro Salazar

-- 
PS
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