> 
> uhci0 at pci0 dev 7 function 2: Intel 82371AB USB Host Controller (PIIX4)
> (rev. 0x01)
> pci_intr_map: no mapping for pin D
> uhci0: couldn't map interrupt
> Is this the reason why my usb floppy not reading disklabel properly from the
> drive?
yes. isn't USB interrupt disabled in BIOS?