readme and doc update

README.md

@@ -141,5 +141,7 @@ Test the prototype.
     [x] reliable shutdown (D11=RED LED, R4=4.7k)
     [x] SDRAM raster back to 0.8 mm
     [ ] connect SPI Flash Quad Mode (QSPI)
-    [ ] allow powering the board without powering FTDI chip
+    [x] allow powering the board without powering FTDI chip
+    [ ] reverse D9 at US2 to draw power from usb instead of provide it
     [ ] micro USB extended pads for Handsoldering
+    [ ] schem gpio pins rename to gp/gn for easier readability

doc/MANUAL.md

@@ -10,6 +10,8 @@
            for experimenting with user-defined USB cores.
            Board provides power to US2.
            Board can't be powered from US2.
+           If you want to power board from US2, reverse diode
+           D9 near US2 connector.
 
     GPDI   Plug for cable to digital monitor or TV,
            4 TMDS+- video