Hi Experts,

I am trying to boot Linux from USB using coreboot and FILO and not able to find any documentation what parameter should I set on FILO prompt. I have enabled USB support while building FILO and libpayload.

Booting from hard disk works fine as below.
Start qemu with -hda disk.img option and give following on FILO prompt
<filo>root (hd0)
<filo>kernel /boot/vmlinuz-2.6.20 root=/dev/hda console=ttyS0
<filo>boot

Now I am trying to boot from USB and start qemu with
-usbdevice disk:disk.img

I am not finding any information what parameter should I set. I tried using root (hd0) (hd1) (sd0) FILO is not able to find my kernel image in /boot/

See errors below.

filo> root (hd1)                                                               
filo> kernel /boot/vmlinuz-2.6.20                                              
Drive 1 does not exist                                                         
                                                                               
Error 15: File not found                                                       
filo> root (sd0)                                                               
filo> kernel /boot/vmlinuz-2.6.20                                               Unknown device type: sda                                                       
                                                                               
Error 15: File not found                                                       
filo> root (hd0)                                                               
filo> kernel /boot/vmlinuz-2.6.20                                              
Drive 0 does not exist                                                         
                                                                               
Error 15: File not found                                                       
filo>                      

Can someone please let me know what is expected device name for the usb I enabled in qemu?