=== modified file 'update.php'
--- update.php	2007-12-17 12:23:00 +0000
+++ update.php	2007-12-17 21:19:26 +0000
@@ -625,6 +625,9 @@ function update_fix_d6_requirements() {
     }
     variable_set('update_d6_requirements', TRUE);
 
+    if (db_table_exists('cache_block')) {
+      $ret[] = update_sql('DROP TABLE {cache_block}');
+    }
     // Create the cache_block table. See system_update_6027() for more details.
     $schema['cache_block'] = array(
       'fields' => array(