Hi,
build-diskimage.sh contains the line
${SUDO} sed "/^stty/s/19200/${TTYSPEED}/" < \
${BASE}/initial-conf/boot.conf > ${MOUNTPOINT}/etc/boot.conf
This does run sed as root, but the redirect is handled by the shell and
writing to ${MOUNTPOINT}/etc/boot.conf fails.
--
Jussi Peltola