Fixed bugs #445 and #446.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@6560 35acf78f-673a-0410-8e92-d51de3d6d3f4


git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@6564 35acf78f-673a-0410-8e92-d51de3d6d3f4