serial: stm32: Add debug uart support
Add support for early debug printf, before the availability of driver model and device tree support. Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Signed-off-by: NPatrice Chotard <patrice.chotard@st.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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