ram: stm32: add second SDRAM bank management
FMC is able to manage 2 SDRAM banks, but the current driver implementation is only able to manage the first SDRAM bank. Even if only bank2 is used, some bank1 registers must be configured. Signed-off-by: NPatrice Chotard <patrice.chotard@st.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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