destroy_reg_param(®_params[0]);
                destroy_reg_param(®_params[1]);
                target_free_working_area(target, crc_algorithm);
-               return 0;
+               return retval;
        }
 
        *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 
        retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
                        erase_check_algorithm->address,
-                       erase_check_algorithm->address + (sizeof(erase_check_code)-2),
+                       erase_check_algorithm->address + (sizeof(erase_check_code)-4),
                        10000, &mips32_info);
        if (retval != ERROR_OK) {
                destroy_reg_param(®_params[0]);
                destroy_reg_param(®_params[1]);
                destroy_reg_param(®_params[2]);
                target_free_working_area(target, erase_check_algorithm);
-               return 0;
+               return retval;
        }
 
        *blank = buf_get_u32(reg_params[2].value, 0, 32);