diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c
index c004aa39da6..eea5659c5f1 100644
--- a/hw/sd/allwinner-sdhost.c
+++ b/hw/sd/allwinner-sdhost.c
@@ -333,10 +333,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
         if (is_write) {
             cpu_physical_memory_read((desc->addr & DESC_SIZE_MASK) + num_done,
                                       buf, buf_bytes);
-
-            for (uint32_t i = 0; i < buf_bytes; i++) {
-                sdbus_write_byte(&s->sdbus, buf[i]);
-            }
+            sdbus_write_data(&s->sdbus, buf, buf_bytes);
 
         /* Read from SD bus */
         } else {
@@ -548,6 +545,7 @@ static void allwinner_sdhost_write(void *opaque, hwaddr offset,
                                    uint64_t value, unsigned size)
 {
     AwSdHostState *s = AW_SDHOST(opaque);
+    uint32_t u32;
 
     trace_allwinner_sdhost_write(offset, value, size);
 
@@ -654,11 +652,9 @@ static void allwinner_sdhost_write(void *opaque, hwaddr offset,
         s->startbit_detect = value;
         break;
     case REG_SD_FIFO:      /* Read/Write FIFO */
-        sdbus_write_byte(&s->sdbus, value & 0xff);
-        sdbus_write_byte(&s->sdbus, (value >> 8) & 0xff);
-        sdbus_write_byte(&s->sdbus, (value >> 16) & 0xff);
-        sdbus_write_byte(&s->sdbus, (value >> 24) & 0xff);
-        allwinner_sdhost_update_transfer_cnt(s, sizeof(uint32_t));
+        u32 = cpu_to_le32(value);
+        sdbus_write_data(&s->sdbus, &u32, sizeof(u32));
+        allwinner_sdhost_update_transfer_cnt(s, sizeof(u32));
         allwinner_sdhost_auto_stop(s);
         allwinner_sdhost_update_irq(s);
         break;
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index e8d055bb895..12e091a46e7 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -181,6 +181,7 @@ static void memcard_write(void *opaque, hwaddr addr, uint64_t value,
                           unsigned size)
 {
     MilkymistMemcardState *s = opaque;
+    uint32_t val32;
 
     trace_milkymist_memcard_memory_write(addr, value);
 
@@ -209,10 +210,8 @@ static void memcard_write(void *opaque, hwaddr addr, uint64_t value,
         if (!s->enabled) {
             break;
         }
-        sdbus_write_byte(&s->sdbus, (value >> 24) & 0xff);
-        sdbus_write_byte(&s->sdbus, (value >> 16) & 0xff);
-        sdbus_write_byte(&s->sdbus, (value >> 8) & 0xff);
-        sdbus_write_byte(&s->sdbus, value & 0xff);
+        val32 = cpu_to_be32(value);
+        sdbus_write_data(&s->sdbus, &val32, sizeof(val32));
         break;
     case R_ENABLE:
         s->regs[addr] = value;
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index b897b1121b8..ddf36915619 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -496,8 +496,6 @@ static uint32_t sdhci_read_dataport(SDHCIState *s, unsigned size)
 /* Write data from host controller FIFO to card */
 static void sdhci_write_block_to_card(SDHCIState *s)
 {
-    int index = 0;
-
     if (s->prnsts & SDHC_SPACE_AVAILABLE) {
         if (s->norintstsen & SDHC_NISEN_WBUFRDY) {
             s->norintsts |= SDHC_NIS_WBUFRDY;
@@ -514,9 +512,7 @@ static void sdhci_write_block_to_card(SDHCIState *s)
         }
     }
 
-    for (index = 0; index < (s->blksize & BLOCK_SIZE_MASK); index++) {
-        sdbus_write_byte(&s->sdbus, s->fifo_buffer[index]);
-    }
+    sdbus_write_data(&s->sdbus, s->fifo_buffer, s->blksize & BLOCK_SIZE_MASK);
 
     /* Next data can be written through BUFFER DATORT register */
     s->prnsts |= SDHC_SPACE_AVAILABLE;
@@ -641,9 +637,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                             &s->fifo_buffer[begin], s->data_count - begin);
             s->sdmasysad += s->data_count - begin;
             if (s->data_count == block_size) {
-                for (n = 0; n < block_size; n++) {
-                    sdbus_write_byte(&s->sdbus, s->fifo_buffer[n]);
-                }
+                sdbus_write_data(&s->sdbus, s->fifo_buffer, block_size);
                 s->data_count = 0;
                 if (s->trnmod & SDHC_TRNS_BLK_CNT_EN) {
                     s->blkcnt--;
@@ -678,9 +672,7 @@ static void sdhci_sdma_transfer_single_block(SDHCIState *s)
         dma_memory_write(s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
     } else {
         dma_memory_read(s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
-        for (n = 0; n < datacnt; n++) {
-            sdbus_write_byte(&s->sdbus, s->fifo_buffer[n]);
-        }
+        sdbus_write_data(&s->sdbus, s->fifo_buffer, datacnt);
     }
     s->blkcnt--;
 
@@ -814,9 +806,7 @@ static void sdhci_do_adma(SDHCIState *s)
                                     s->data_count - begin);
                     dscr.addr += s->data_count - begin;
                     if (s->data_count == block_size) {
-                        for (n = 0; n < block_size; n++) {
-                            sdbus_write_byte(&s->sdbus, s->fifo_buffer[n]);
-                        }
+                        sdbus_write_data(&s->sdbus, s->fifo_buffer, block_size);
                         s->data_count = 0;
                         if (s->trnmod & SDHC_TRNS_BLK_CNT_EN) {
                             s->blkcnt--;
