The setenv command is for u-boot. You probably ran it in the preinstalled Linux system. Type "reboot" and when the machine restarts it will be in u-boot, you can press a key to interrupt the boot process and then type setenv and other u-boot commands.
I got it working, tryign to upgrade my uboot I am having problems
When i try to upgrade it with a USB, I get this error:
Invalid Fat Entry 4096 bytes read"
when i try fatload usb 0:1 0x0800000 uboot.bin
I aso tried with TFTP and still no luck
And with a different usb stick, that one just hung after i did usb start, trying to find it
Any ideas? I even tried the Sheevainstaller and that did not work either!