[U-Boot-Users] bootp

I'm using u-boot 1.0.0 on a xilinx embedded ppc 405 and I see the follow unexplained behavior:

if I do a bootp <address> <filename> it always bootp's the filename stored in environment variable bootfile rather than the filename I specify in the command line. If I have no bootfile env variable it tries to bootp a garbage file name.

If I use tftpboot <address> <filename> it gets the file name on the cmd line.

I don't think this is expected behavior. Is that incorrect? Any ideas what I'm doing wrong?