These days BIOS and IPMI (and other no doubt) updates are getting larger.
Most of the boot floppies you can download are 1.4MB which makes upgrading some firmware modules difficult when PXE booting as the images wont fit.
I was able to build a 20MB image using these commands.
wget http://itblog.su/downloads/W98SE_R.img
rpm -ivh ms-sys-2.2.0-1.el5.rf.i386.rpm
dd if=/dev/zero of=floppy.img bs=1024 count=20000
mkdosfs floppy.img
ms-sys -1 -f floppy.img
mount -o loop floppy.img /mnt/floppy
mount /W98SE_R.img /mnt/dos
cp /mnt/dos/* /mnt/floppy/
umount /mnt/dos/
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