ia64 patch (Re: ask 'root device: ?')

Hi! all,

I will commit this patch at next week.

  http://mail-index.netbsd.org/port-ia64/2009/06/18/msg000102.html

Most influences below arch/ia64.  However, please note that there is a
correction that influences com <at> acpi.
Please teach to me if you have a different idea.

Thanks
--
kiyohara