Not check versions of BIOS. Checking hash is enough.

client/site_tests/hardware_Components/approved_components

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
     # key: component ID
     # value: a list of approved component IDs ('*' indicates any)
     'hash_ro_firmware': ['*'],
     'part_id_3g': ['*'],
     'part_id_gps': ['*'],
     'part_id_audio_codec': ['*'],
-    'part_id_bios': ['*'],
     'part_id_bluetooth': ['*'],
     'part_id_cardreader': ['*'],
     'part_id_chipset': ['*'],
     'part_id_chrontel': ['*'],
     'part_id_cpu': ['*'],
     'part_id_display_panel': ['*'],
     'part_id_embedded_controller': ['*'],
     'part_id_ethernet': ['*'],
     'part_id_flash_chip': ['*'],
     'part_id_hwqual': ['*'],
     'part_id_storage': ['*'],
     'part_id_usb_hosts': ['*'],
     'part_id_vga': ['*'],
     'part_id_webcam': ['*'],
     'part_id_wireless': ['*'],
+    'vendor_id_bios': ['*'],
     'vendor_id_touchpad': ['*'],
     'ver_rw_firmware': ['*'],
 }
 
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