diff --git a/configs/open1788/include/board.h b/configs/open1788/include/board.h
index 7991d3c095..8ebe31a0fb 100644
--- a/configs/open1788/include/board.h
+++ b/configs/open1788/include/board.h
@@ -76,6 +76,9 @@
 
 /* Select the main oscillator as the frequency source.  SYSCLK is then the frequency
  * of the main oscillator.
+ *
+ * If BOARD_XTAL_FREQUENCY > 15000000, then the SCS OSCRS bit (bit 4) should also
+ * be set in the BOARD_SCS_VALUE.
  */
 
 #undef CONFIG_LPC17_MAINOSC
diff --git a/configs/sam3u-ek/knsh/defconfig b/configs/sam3u-ek/knsh/defconfig
index fa3c1502f9..bbd3662c11 100755
--- a/configs/sam3u-ek/knsh/defconfig
+++ b/configs/sam3u-ek/knsh/defconfig
@@ -182,7 +182,8 @@ CONFIG_FDCLONE_DISABLE=n
 CONFIG_FDCLONE_STDIO=n
 CONFIG_SDCLONE_DISABLE=y
 CONFIG_NXFLAT=n
-CONFIG_SCHED_WORKQUEUE=n
+CONFIG_SCHED_WORKQUEUE=y
+CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_WORKPRIORITY=192
 CONFIG_SCHED_WORKPERIOD=50000
 CONFIG_SCHED_WORKSTACKSIZE=1024