diff --git a/devicemodel/hw/platform/usb_pmapper.c b/devicemodel/hw/platform/usb_pmapper.c
index df3c577ae..449ddcb30 100644
--- a/devicemodel/hw/platform/usb_pmapper.c
+++ b/devicemodel/hw/platform/usb_pmapper.c
@@ -902,6 +902,36 @@ done:
 	return xfer->status;
 }
 
+static void
+clear_uas_desc(struct usb_dev *udev, uint8_t *data, uint32_t len)
+{
+	struct usb_devpath *path;
+	int32_t i;
+
+	/* only process configuration descriptor */
+	if (len < 2 || data[1] != 0x2)
+		return;
+
+	i = 0;
+	path = &udev->info.path;
+	while (i < len) {
+		/* When UAS protocol is found in interface descriptor, set it
+		 * to invalid value.
+		 *
+		 * According to USB3 spec 9.6.5, Standard Interface Descriptor,
+		 * data[i+0] => bLength
+		 * data[i+1] => bDescriptorType
+		 * data[i+7] => bInterfaceProtocol
+		 */
+		if (data[i] == 9 && data[i+1] == 0x4 && data[i+7] == 0x62) {
+			UPRINTF(LFTL, "%d-%s: clear uas protocol\r\n",
+					path->bus, usb_dev_path(path));
+			data[i+7] = 0;
+		}
+		i = i + data[i];
+	}
+}
+
 int
 usb_dev_request(void *pdata, struct usb_data_xfer *xfer)
 {
@@ -914,6 +944,7 @@ usb_dev_request(void *pdata, struct usb_data_xfer *xfer)
 	struct usb_data_xfer_block *blk;
 	uint8_t *data;
 	int rc;
+	bool need_chk_uas = false;
 
 	udev = pdata;
 	xfer->status = USB_ERR_NORMAL_COMPLETION;
@@ -960,6 +991,10 @@ usb_dev_request(void *pdata, struct usb_data_xfer *xfer)
 		UPRINTF(LDBG, "UR_SET_INTERFACE\n");
 		usb_dev_set_if(udev, index, value, xfer);
 		goto out;
+	case UREQ(UR_GET_DESCRIPTOR, UT_READ):
+		if (value == 0x0200)
+			need_chk_uas = true;
+		break;
 	case UREQ(UR_CLEAR_FEATURE, UT_WRITE_ENDPOINT):
 		if (value) {
 			/* according to usb spec (ch9), this is impossible */
@@ -985,6 +1020,13 @@ usb_dev_request(void *pdata, struct usb_data_xfer *xfer)
 	rc = libusb_control_transfer(udev->handle, request_type, request,
 			value, index, data, len, 300);
 
+	/* TODO: Currently, the USB Attached SCSI (UAS) protocol is not
+	 * supported and the following code is used as a workaround now.
+	 * UAS will be implemented in future.
+	 */
+	if (need_chk_uas)
+		clear_uas_desc(udev, data, rc);
+
 	if (rc >= 0 && blk) {
 		blk->blen = len - rc;
 		blk->bdone += rc;