wandboard: Switch to SPL support

Currently we need to build one U-boot image for each of the wandboard
variants: quad, dual-lite and solo.

By switching to SPL we can support all these variants with a single binary,
which is very convenient.

Based on the work from Richard Hu.

Tested kernel booting on the three boards.

Signed-off-by: Richard Hu <hakahu@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Vagrant Cascadian <vagrant@aikidev.net>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/wandboard/README b/board/wandboard/README
index 1f678e1..c6c0132 100644
--- a/board/wandboard/README
+++ b/board/wandboard/README
@@ -12,31 +12,25 @@
 Building U-boot for Wandboard
 -----------------------------
 
-To build U-Boot for the Wandboard Dual Lite version:
+To build U-Boot for the Wandboard:
 
-$ make wandboard_dl_config
-$ make
-
-To build U-Boot for the Wandboard Solo version:
-
-$ make wandboard_solo_config
-$ make
-
-To build U-Boot for the Wandboard Quad version:
-
-$ make wandboard_quad_config
+$ make wandboard_config
 $ make
 
 Flashing U-boot into the SD card
 --------------------------------
 
-- After the 'make' command completes, the generated 'u-boot.imx' binary must be
+- After the 'make' command completes, the generated 'SPL' binary must be
 flashed into the SD card;
 
-$ sudo dd if=u-boot.imx of=/dev/mmcblk0 bs=512 seek=2; sync
+$ sudo dd if=SPL of=/dev/mmcblk0 bs=1k seek=1; sync
 
 (Note - the SD card node may vary, so adjust this as needed).
 
+- Flash the u-boot.img image into the SD card:
+
+sudo dd if=u-boot.img of=/dev/mmcblk0 bs=1k seek=69; sync
+
 - Insert the SD card into the slot located in the bottom of the board (same side
 as the mx6 processor)