+#ifdef CONFIG_BLK
+int host_dev_bind(int devnum, char *filename)
+{
+ struct host_block_dev *host_dev;
+ struct udevice *dev;
+ char dev_name[20], *str, *fname;
+ int ret, fd;
+
+ /* Remove and unbind the old device, if any */
+ ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
+ if (ret == 0) {
+ ret = device_remove(dev, DM_REMOVE_NORMAL);
+ if (ret)
+ return ret;
+ ret = device_unbind(dev);
+ if (ret)
+ return ret;
+ } else if (ret != -ENODEV) {
+ return ret;
+ }
+
+ if (!filename)
+ return 0;
+
+ snprintf(dev_name, sizeof(dev_name), "host%d", devnum);
+ str = strdup(dev_name);
+ if (!str)
+ return -ENOMEM;
+ fname = strdup(filename);
+ if (!fname) {
+ free(str);
+ return -ENOMEM;
+ }
+
+ fd = os_open(filename, OS_O_RDWR);
+ if (fd == -1) {
+ printf("Failed to access host backing file '%s'\n", filename);
+ ret = -ENOENT;
+ goto err;
+ }
+ ret = blk_create_device(gd->dm_root, "sandbox_host_blk", str,
+ IF_TYPE_HOST, devnum, 512,
+ os_lseek(fd, 0, OS_SEEK_END), &dev);
+ if (ret)
+ goto err_file;
+ ret = device_probe(dev);
+ if (ret) {
+ device_unbind(dev);
+ goto err_file;
+ }
+
+ host_dev = dev_get_priv(dev);
+ host_dev->fd = fd;
+ host_dev->filename = fname;
+
+ return blk_prepare_device(dev);
+err_file:
+ os_close(fd);
+err:
+ free(fname);
+ free(str);
+ return ret;
+}
+#else