[U-Boot] Read uEnv.txt from EXT4 partition

[uMinded Strikes Again]

I am running U-Boot 2013.01-05972-gd80f33a. When I power the board I get:

** Unrecognized filesystem type **
206 bytes read in 21 ms (8.8 KiB/s)
Loaded environment from uEnv.txt
** Unrecognized filesystem type **
** File not found boot.scr **
** File not found boot/boot.scr **
** Unrecognized filesystem type **
uboot#

So I issue these commands:

setenv bootargs 'root=/dev/mmcblk0p1 rw rootwait=3 console=ttyS0,115200n8
loglevel=7 mem=256M at 0x40000000'
ext4load mmc 0 0x43000000 /boot/script.bin;
ext4load mmc 0 0x48000000 /boot/uImage;
bootm 0x48000000

And the system boots as expected. So I know that uboot can read from my
EXT4 partition. Is their any way to change the default filesystem type from
FAT or change the default boot scan to search for uEnv.txt in /boot as well
as different filesystems?

Thanks!