bossa only waited 1ms for the serial device instead calling
tcdrain().
Without this patch bossa is failing to flash a ATSAM3S4 8/10 times.
Patch has been submitted as PR#150 upstream.
https://github.com/shumatech/BOSSA/pull/150
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Alexander Couzens