In article <20051209114314.191073D87@string1.ciencias.uniovi.es> you wrote:
> Is there a miniroot filesystem for NetBSD/i386?  From a search on

No, but I think you can dd(1) a boot-big.fs to /dev/wd0b and then at the 
bootloader (5 second countdown etc.) say "boot hd0b:".

Maybe make sure you have swap off or write the floppy in  singleuser 
mode:

	netbsd1# shutdown now
	...
	# cd /root
===>	# cat <boot-big.fs >/dev/wd0b                                                  
	# reboot
	Dec  9 23:35:45 reboot: rebooted by root
	unmounting file systems... done
	rebooting...
	
	>> NetBSD/i386 BIOS Boot, Revision 3.3
	>> (riz@faith.netbsd.org, Sat Sep 10 05:53:16 UTC 2005)
	>> Memory: 639/15360 k
	Press return to boot now, any other key for boot menu
	booting hd0a:netbsd - starting in 0 
	type "?" or "help" for help.
	> boot wd0b:
	booting wd0b:netbsd
	open wd0b:: Device not configured
	boot: wd0b:netbsd: Device not configured
===>	> boot hd0b:
===>	booting hd0b:netbsd
	3703408+5199164/

(from a 'qemu -nographic' session)
	

 - Hubert