ld -T ld.script -X --warn-common -nopie -o bsd ${SYSTEM_HEAD} vers.o ${OBJS}
text    data    bss     dec     hex
1623758 2360488 483328  4467574 442b76
mv bsd bsd.gdb
ctfstrip -S -o bsd bsd.gdb
cp -p /usr/src/distrib/amd64/ramdiskA/../../../sys/arch/amd64/compile/RAMDISK/obj/bsd bsd
cp bsd bsd.rd
rdsetroot bsd.rd mr.fs
objcopy -S -R .comment -R .SUNW_ctf  -K rd_root_size -K rd_root_image  bsd.rd bsd.strip
gzip -9cn bsd.strip > bsd.gz
dd if=/dev/zero of=floppy72.img bs=512 count=2880
2880+0 records in
2880+0 records out
1474560 bytes transferred in 0.007 secs (206951665 bytes/sec)
vnconfig -v floppy72.img > vnd
vnd0: 1474560 bytes on floppy72.img
disklabel -w `cat vnd` floppy3
newfs -O 1 -m 0 -o space -i 524288 -c 2880 /dev/r`cat vnd`a
/dev/rvnd0a: 1.4MB in 2880 sectors of 512 bytes
1 cylinder groups of 1.41MB, 360 blocks, 32 inodes each
super-block backups (for fsck -b #) at:
 32,
mount /dev/`cat vnd`a /mnt
objcopy -S -R .comment /data/OpenBSD/usr/mdec/fdboot /usr/src/distrib/amd64/ramdiskA/obj/boot
installboot -v -r /mnt `cat vnd`  /data/OpenBSD/usr/mdec/biosboot /usr/src/distrib/amd64/ramdiskA/obj/boot
Using /mnt as root
installing bootstrap on /dev/rvnd0c
using first-stage /data/OpenBSD/usr/mdec/biosboot, second-stage /usr/src/distrib/amd64/ramdiskA/obj/boot
copying /usr/src/distrib/amd64/ramdiskA/obj/boot to /mnt/boot
looking for superblock at 65536
bad superblock magic 0x14458bdc
looking for superblock at 8192
found valid ffs1 superblock
/mnt/boot is 12 blocks x 4096 bytes
fs block shift 0; part offset 0; inode block 56, offset 936
expecting 32-bit fs blocks (incr 0)
/data/OpenBSD/usr/mdec/biosboot will be written at sector 0
install -c -m 555 -o root -g wheel bsd.gz /mnt/bsd

/mnt: write failed, file system is full

-----------------------------------------------------------------------------------------------------------------

# mount
/dev/vnd0a on /mnt type ffs (local)

# df
Filesystem   512-blocks      Used     Avail Capacity  Mounted on
/dev/vnd0a         2815        94      2721     4%    /mnt

512*2721=1393152 bytes

# ls -l /usr/obj/distrib/amd64/ramdiskA/bsd.gz
-rw-r--r--  1 root  wobj  1391770 Feb 13 11:16 /usr/obj/distrib/amd64/ramdiskA/bsd.gz

It should fit, but it doesn't...

cp /usr/obj/distrib/amd64/ramdiskA/bsd.gz /mnt/
/mnt: write failed, file system is full
cp: /mnt/bsd.gz: No space left on device