How to change the booting device order

[Nathan Ye <webmaster@hz.col.com.cn>]

	I install one NCR pci scsi card and one ADAPTEC aha1542 isa card
in my computer.
	When I build the kernel, ncr0 always shot up in front of the aha0
device. But I want to use the disk attacted to aha0 as the root disk, what
should I do to let kernel find aha device first?


-Nathan