ef42c25140
In the where CONFIG_SDIO_PREFLIGHT is not used and dcache write-buffed mode is used (not write-through) buffer alignment is required for DMA transfers because a) arch_invalidate_dcache could lose buffered writes data and b) arch_flush_dcache could corrupt adjacent memory if the buffer and the bufflen, are not on ARMV7M_DCACHE_LINESIZE boundaries.