3GB limit? *2* GB limit?!

[Miles Nordin]

I'm trying to experiment with ubifs on a 16GB USB stick.  I've
downloaded and built:

  ~2009-02-01
  git://git.infradead.org/~dedekind/ubifs-v2.6.25.git  -- full kernel tree. :(
  git://git.infradead.org/mtd-utils.git  (sys-fs/mtd-utils-9999 in gentoo)

I'm running these commands and getting this output:

-----8<-----
# uname -a
Linux fishstick 2.6.25-gentoo-r8 #2 SMP PREEMPT Wed Feb 4 05:23:36 UTC 2009 i686 AMD Phenom(tm) 9850 Quad-Core Processor AuthenticAMD GNU/Linux
# ls -l /dev/mtd*
ls: cannot access /dev/mtd*: No such file or directory
# modprobe block2mtd block2mtd=/dev/sdj,128KiB
# modprobe mtdchar
# ls -l /dev/mtd*
crw-rw---- 1 root root 90, 0 Feb  4 06:29 /dev/mtd0
crw-rw---- 1 root root 90, 1 Feb  4 06:29 /dev/mtd0ro
fishstick devices # ubiformat /dev/mtd0
ubiformat: mtd0 (RAM-based), size 3246391296 bytes (3.0 GiB), 131072 eraseblocks of 131072 bytes (128.0 KiB), min. I/O size 1 bytes
libscan: scanning eraseblock 16384 -- 66 % complete  libmtd: error!: cannot seek mtd0 to offset 18446744071562067968
        error 22 (Invalid argument)
ubiformat: error!: failed to scan mtd0 (/dev/mtd0)
# fdisk /dev/sdj
Device contains neither a valid DOS partition table, nor Sun, SGI 
[...]
Command (m for help): p

Disk /dev/sdj: 16.1 GB, 16131293184 bytes
-----8<-----

sooo.....first, size is 3.0GiB?  not 16GiB?

second, ubiformat has 2GB limit?  Is this FAT or something---what
gives?  Have I missed a ``wings stay on'' switch in 'make menuconfig'?
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