Fixed bug #518.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7104 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed bug #519.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7105 35acf78f-673a-0410-8e92-d51de3d6d3f4