[U-Boot] bootefi disk probe once?

Hi Alex, Heinrich,

During testing bootefi command, I found that:

If I type 'bootefi' at first time, and forgot to probe the disk before, I got:

Found 0 disks

Later I did the disk probe (eg: usb start, or scsi scan), and re-run 'bootefi', the disk was not probed for the 2nd time by 'bootefi'.

Is this bug, or intended design?

Regards, Bin