diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 78aabb6..990f038 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -1095,6 +1095,22 @@
     return sd_illegal;
 }
 
+/* Configure fields for following sd_generic_write_byte() calls */
+__attribute__((unused))
+static sd_rsp_type_t sd_cmd_to_receivingdata(SDState *sd, SDRequest req,
+                                             uint64_t start, size_t size)
+{
+    if (sd->state != sd_transfer_state) {
+        return sd_invalid_state_for_cmd(sd, req);
+    }
+    sd->state = sd_receivingdata_state;
+    sd->data_start = start;
+    sd->data_offset = 0;
+    /* sd->data[] used as receive buffer */
+    sd->data_size = size ?: sizeof(sd->data);
+    return sd_r1;
+}
+
 /* Configure fields for following sd_generic_read_byte() calls */
 static sd_rsp_type_t sd_cmd_to_sendingdata(SDState *sd, SDRequest req,
                                            uint64_t start,
@@ -1943,6 +1959,19 @@
     return rsplen;
 }
 
+/* Return true if buffer is consumed. Configured by sd_cmd_to_receivingdata() */
+__attribute__((unused))
+static bool sd_generic_write_byte(SDState *sd, uint8_t value)
+{
+    sd->data[sd->data_offset] = value;
+
+    if (++sd->data_offset >= sd->data_size) {
+        sd->state = sd_transfer_state;
+        return true;
+    }
+    return false;
+}
+
 /* Return true when buffer is consumed. Configured by sd_cmd_to_sendingdata() */
 static bool sd_generic_read_byte(SDState *sd, uint8_t *value)
 {