[U-Boot] bootfile environment variable

[l3iggs .]

Hello,I have a DHCP server set up to provide all of the environment variables listed at the bottom of this page: http://www.denx.de/wiki/view/DULG/UBootEnvVariablesSpecifically, I've configure my DHCP server to provide option #67, Bootfile name, as "zImage"u-boot picks up on this nicely and so when I run=> dhcpu-boot downloads zImage from my TFTP server. However, I've found it impossible to download any other file with this setup. For example, I expect that when I execute=> dhcp 0x120000000 192.168.1.1:zImage2or=> dhcp zImage2I should get the zImage2 file. Unfortunately, zImage is downloaded in all cases. I've been unable to find any command (DHCP, TFTP) that I can issue that will allow me to download any file other than the DHCP provided default file. Removing/disabling option #67 from my DHCP server solves the problem and u-boot can download any file I ask from my TFTP server. 
I'm running commit 9665fa8f9e1488209d5e01d0792c243e0a220c5a
It seems like the proper behavior would be be that the DHCP provided file name is overridden by a file name given at the u-boot prompt and the DHCP provided file name is only downloaded when no file name is specified at the command line.
Can anyone else confirm this issue?
Thanks,l3iggs