Change detection order for firewire vs SCSI?

[Howard Jones]

I have an old dual-P3 server with an internal SCSI backplane. I also 
have an external firewire drive attached to it as cheap, 'disposable' 
storage. It all works swimmingly apart from one thing: When the system 
boots, it loads the kernel from the SCSI drive OK, then at some stage it 
changes it's idea of what da0 is from the first SCSI drive to the 
firewire one, and then fails to boot since there's no da0s1a on the 
firewire drive. Unplugging the firewire drive and rebooting works, but 
means it can't be done unattended, obviously.

Is there any way to stop or change this behaviour? I couldn't see 
anything in the sbp(4) manpage...

I'm running FreeBSD 6.1-RELEASE, in case it's relevant.

Thanks for any pointers.

Howie