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* arch/arm/src/stm32/stm32f2xx_dma.c, stm32f4xx_dma.c, stm32_serial.c, and
stm32_spic.c: DMA priority was getting zeroed by STM32 F2/F4 DMA drivers
so that all DMAs ran at the lowest priority.
+ * configs/stm3240g-eval/include/board.h and configs/stm3220: Drop SD card
+ frequency from 24 to 16 MHz. Apparently 24 MHz is too fast for the board.
+ This (plus the change to the STM32 DMA (above) fixes SDIO DMA on the
+ STM3240G-EVAL (and probably STM3220G-EVAL -- untested).