sudo, not su.

[C. Scott Ananian]

I'd like to draw devel@'s attention to trac bug 5537, which might land
sometime soon:
   http://dev.laptop.org/ticket/5537
The upshot would be that, instead of logging in directly as root with
no password, you would log in directly as *olpc* with no password, and
then sudo to root (if you need root).  Please comment in the bug if
you have strong objections and/or be prepared to try logging in as
'olpc' if 'root' seems to stop working in a new build.
 --scott

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