On the assumption that a new "floppy" install media will be produced,
the following mods allow the normal boot.fs to grow as needed.
This doesn't remove the need to set an appropriate value in the
INSTALL config, but it helps.

Sound plausible?

--sjg

Index: distrib/sparc/bootfs/Makefile
===================================================================
RCS file: /cvsroot/basesrc/distrib/sparc/bootfs/Makefile,v
retrieving revision 1.19
diff -u -p -r1.19 Makefile
--- Makefile    2000/05/02 16:06:54     1.19
+++ Makefile    2000/05/05 10:21:18
@@ -26,7 +26,7 @@ RAMDISK!=     cd ${TOP}/ramdisk/; \
                printf "xxx: .MAKE\n\t@echo \$${.OBJDIR}/ramdisk.fs\n" |\
                ${MAKE} -s -f-
 
-DISKTYPE=      floppy
+DISKTYPE=      instfs
 
 # Some reasonable values for the -i parameter to newfs are:
 #
@@ -35,12 +35,18 @@ DISKTYPE=   floppy
 # 204800       1167k,  29 inodes free
 INO_BYTES=     204800
 
-CLEANFILES+=   netbsd.ram.gz netbsd.tmp
+BLOCKSIZE=512
+FSTSIZE=32
+FSSIZE!=BLOCKSIZE=${BLOCKSIZE} du -s ${RAMDISK} | awk '{ print $$1 }'
+FSSIZE!= expr ${FSTSIZE} \* \( \( ${FSSIZE} + ${FSTSIZE} - 1 \) / ${FSTSIZE} \)
+FSNC!=expr ${FSSIZE} / ${FSTSIZE}
 
-all:   netbsd.ram.gz
-       dd if=/dev/zero of=${IMAGE} bs=1440k count=1
+CLEANFILES+=   netbsd.ram.gz netbsd.tmp disktab.tmp
+
+all:   netbsd.ram.gz disktab.tmp
+       dd if=/dev/zero of=${IMAGE} bs=${BLOCKSIZE} count=${FSSIZE}
        vnconfig -t ${DISKTYPE} -v -c ${VND_CDEV} ${IMAGE}
-       disklabel -rw ${VND_CDEV} ${DISKTYPE}
+       disklabel -f disktab.tmp -rw ${VND_CDEV} ${DISKTYPE}
        disklabel -W ${VND_CDEV}
        newfs -B be -m 0 -o space -i ${INO_BYTES} -c 80 ${VND_RDEV}
        mount ${VND_DEV} ${MOUNT_POINT}
@@ -59,6 +65,9 @@ all:  netbsd.ram.gz
 unconfig:
        -umount -f ${MOUNT_POINT}
        -vnconfig -u ${VND_DEV}
+
+disktab.tmp:	netbsd.ram.gz
+       @echo "instfs:ty=floppy:se#512:nt#2:rm#300:ns#16:nc#${FSNC}:pa#${FSSIZE}
:oa#0:ba#4096:fa#512:ta=4.2BSD:pc#${FSSIZE}:oc#0:" > ${.TARGET}
 
 netbsd.ram: ${KERN} ${RAMDISK}
        cp ${KERN} netbsd.tmp