Add default switch settings.

doc/README.Purple

@@ -11,6 +11,20 @@ Installation Instructions:
 	|   X|	
 	------
 
+   Put the s3 switch into the following position:
+
+	1   0
+	------
+	|x   |
+	|x   |
+	|x   |	
+	|x   |
+	|x   |
+	|   x|
+	|   x|
+	|x   |	
+	------
+
 2. Connect to the serial console and to the BDI. Power on. On the
    serial line, you should see:
 
@@ -34,8 +48,17 @@ Installation Instructions:
 
 	prog 0xB0000000 <u-boot.bin> bin
 
-6. Power off. Restore the original S2 switch position. Power on.
-   U-Boot should come up.
+6. Power off. Restore the original S2 switch position:
+
+	 1  0
+	------
+	|   x|
+	|   x|
+	|x   |	
+	|   X|	
+	------
+
+   Power on.  U-Boot should come up.
 
 
 
@@ -48,5 +71,5 @@ can't really check whether 'erase' is complete by polling flash as it
 is usually done. Instead, the flash driver simply waits for a given
 time and assumes that erase then has passed. This behaviour is
 identical to what the VxWorks driver does; also, the same timeout (6
-seconds) was chosen. Note that this timeout applies for each errase
+seconds) was chosen. Note that this timeout applies for each erase
 operation, i. e. per erased sector.