Are you trying to make an installation floppy disk or just a 
"standalone" kernel? We use the following process to build "standalone" 
kernels:

1) configure and compile a kernel with options MEMORY_DISK_HOOKS, 
MEMORY_DISK_IS_ROOT and MINIROOTSIZE (and optionaly 
MEMORY_DISK_SERVER=0), see src/sys/arch/sandpoint/conf/RAMDISK
2) set up a directory to contain the files for the ramdisk and possibly 
an mtree-file and use makefs (8) to create an image-file of the 
directory (use "-s"-flag to set the size to the same as MINIROOTSIZE in 
step 1).
3) use mdsetimage (8) to copy the image-file into the kernel built in step 1

/Erik

Boo Geum Jung wrote:

>2M seems to be insufficient to execute standalone on RAM, I don't know the
>exact resean now.
>So I'd like to extent the size of floppyinstfs from 2M to 8M.
>What should I change?
>Should I change disktab?
>
>floppyinstfs|NetBSD floppy install filesystem:\
>        :ty=floppy:se#512:nt#1:rm#300:ns#64:nc#64:\
>        :pa#4096:oa#0:ba#4096:fa#512:ta=4.2BSD:\
>        :pc#4096:oc#0:
>
>
>