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Get the code...
git clone git://github.com/jonsmirl/lpc31xx-uboot.git
cd lpc31xx-uboot

Setup the environment (in .bashrc)...
export CROSS_COMPILE=arm-linux-gnueabi-
export ARCH=arm

Configure it...
make EA3131_config

Build it...
make
make u-boot.img
cat spl/u-boot-spl.bin u-boot.img >bootme.bin

Making the SD card

sudo fdisk -c=dos -u=cylinders /dev/sdi
Note that the first partition was created out of order
Device Boot      Start         End      Blocks   Id  System
/dev/sdi1               3           8        2976    b  W95 FAT32
/dev/sdi2               1           2         961   df  BootIt
/dev/sdi3               9        1008      496000   83  Linux
Copy the spl+uboot combo to the SD Card...
sudo dd if=bootme.bin of=/dev/sdi2 bs=512
Copy the kernel....
Copy the file system....
cd /dev/sdi3
tar xpSf /home/apps/florida/lpc31xx-openwrt/bin/lpc313x/openwrt-lpc313x-rootfs.tar.gz
Eject the parent drive - force everything to flush to the card
Give it a spin and see if it works.