mx6qsabrelite: Add boot switch setting information into the README

Add boot switch setting information into the README

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/doc/README.mx6qsabrelite b/doc/README.mx6qsabrelite
index 0498cba..6f2f534 100644
--- a/doc/README.mx6qsabrelite
+++ b/doc/README.mx6qsabrelite
@@ -31,7 +31,8 @@
 Note: This writes SD card loader at address 0
 
 2. Put this SD card into the slot for the large SD card (SD3 on the bottom of
-the board)
+the board). Make sure SW1 switch is at position "00", so that it can boot
+from the fuses.
 
 3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot
 (the default one the board is shipped with, starting from the SPI NOR) and