You can add another branches entry to the svn-remote section of your .git/config file. After that, starting git svn fetch should output additional revisions.
If I understand correctly, you can force git-svn to rescan old versions of branches by removing (or changing) the max-branchesRev from .git/svn/.metadata and running git svn fetch again. If you change the line instead of deleting it, you will want to install it on the version earlier than when your branch was created. Then it will rescan the branches for all changes after that.
I probably should have first with git svn reset instead of messing with .git/svn/.metadata . If the following does not work, then I have no ideas. :)
Then you can use git svn as usual.
jamessan
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