diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index ba6fbfe..e5fedb3 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -618,7 +618,7 @@
 
 int mmc_change_freq(struct mmc *mmc)
 {
-	char ext_csd[512];
+	ALLOC_CACHE_ALIGN_BUFFER(char, ext_csd, 512);
 	char cardtype;
 	int err;
 
@@ -860,7 +860,7 @@
 	uint mult, freq;
 	u64 cmult, csize, capacity;
 	struct mmc_cmd cmd;
-	char ext_csd[512];
+	ALLOC_CACHE_ALIGN_BUFFER(char, ext_csd, 512);
 	int timeout = 1000;
 
 #ifdef CONFIG_MMC_SPI_CRC_ON