Index: boot/generic/src/printf_core.c
===================================================================
--- boot/generic/src/printf_core.c	(revision 53031c207fe3e604f18be745ce8f0d770315f9ca)
+++ boot/generic/src/printf_core.c	(revision e330da6e8c9b0dc3c32eed16c06b64b13f0a6963)
@@ -605,7 +605,10 @@
 			
 			switch (uc) {
-			/** @todo Unimplemented qualifiers:
-			 *        t ptrdiff_t - ISO C 99
-			 */
+			case 't':
+				/* ptrdiff_t */
+				if (sizeof(ptrdiff_t) == sizeof(int32_t))
+					qualifier = PrintfQualifierInt;
+				else
+					qualifier = PrintfQualifierLongLong;
 			case 'h':
 				/* Char or short */