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23a19e0358
Because before switching to a lower clock source, we must switch the clock source first instead of last. So before configuring the PMC_MCKR register, invoke at91_mck_init_down() first. As said in datasheet, the the size of SPL must not exceed the maximum size allowed(64Kbytes). Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com> Reviewed-by: Simon Glass <sjg@chromium.org>