[U-Boot] Syncing custodian tree (the new way) - What am I doing wrong?

[Graeme Russ]

Wolfgang,

I'm trying to figure out what I'm doing wrong trying to sync my local x86
repo as per the 'new' instructions on the wiki. This is what I get:

graeme at helios:~/Source/U-Boot/x86$ git rebase ${upstream}/master
fatal: Needed a single revision
invalid upstream u-boot/master

Any idea?

Regards,

Graeme