Hey Chris,
Thanks for catching that, my bad! Anyways, when writing the new U-Boot to the correct partition, UBL doesn't bring up U-Boot: (As per your last comment, I even made the U-Boot partition a bit smaller as to not interfere with the Linux partition)
root@arago:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00020000 00020000 "u-boot env"
mtd1: 00020000 00020000 "UBL"
mtd2: 00160000 00020000 "u-boot"
mtd3: 00200000 00020000 "kernel"
mtd4: 01000000 00020000 "filesystem"
mtd5: 01000000 00020000 "ap4_fs"
mtd6: 00200000 00020000 "kernel2"
mtd7: 1da00000 00020000 "filesystem_large"
root@arago:~# ls -al u-*
-rw-r--r-- 1 root root 372036 Jul 25 22:04 u-boot-new.bin
root@arago:~#
root@arago:~# flash_eraseall /dev/mtd2
Erasing 128 Kibyte @ 160000 -- 100 % complete.
root@arago:~# nandwrite -p /dev/mtd2 u-boot-new.bin
Writing data to block 0 at offset 0x0
Writing data to block 1 at offset 0x20000
Writing data to block 2 at offset 0x40000
root@arago:~# sync
root@arago:~# sync
root@arago:~# reboot
Broadcast message from root (ttyS2) (Fri Jul 25 22:09:41 2014):
The system is going down for reboot NOW!
INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal
INIT: Sending processes thStopping syslogd/klogd: stopped syslogd (pid 1078)
stopped klogd (pid 1080)
done
Deconfiguring network interfaces... done.
Sending all processes the TERM signal...
Sending all processes the KILL signal...
Unmounting remote filesystems...
Deactivating swap...
Unmounting local filesystems...
mount: can't find /mnt/ram in /proc/mounts
umount: none busy - remounted read-only
mount: cannot read /proc/mounts: No such file or directory
Rebooting... Restarting system.
OMAP-L138 initialization passed!
Booting TI User Boot Loader
UBL Version: 1.65
UBL Flashtype: NAND
Starting NAND Copy...
No valid boot image found!
NAND Boot failed.
Aborting...