To sync d-i kfreebsd branch to d-i trunk, e.g. r59038, from a clean working copy of d-i kfreebsd branch (.) run
$ svn merge --dry-run -r 59022:59038 svn+ssh://user@svn.d-i.alioth.debian.org/svn/d-i/trunk .
--dry-run "try operation but make no changes".
If all is ok, run the same command without --dry-run and then
$ svn ci -m "Sync to r59038."