arm: ls102xa: Add SD boot support for LS1021AQDS board

This patch adds SD boot support for LS1021AQDS board. SPL
framework is used. PBL initialize the internal RAM and copy
SPL to it, then SPL initialize DDR using SPD and copy u-boot
from SD card to DDR, finally SPL transfer control to u-boot.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Signed-off-by: Jason Jin <jason.jin@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/ls1021aqds/ls102xa_rcw_sd.cfg b/board/freescale/ls1021aqds/ls102xa_rcw_sd.cfg
new file mode 100644
index 0000000..9d99bd8
--- /dev/null
+++ b/board/freescale/ls1021aqds/ls102xa_rcw_sd.cfg
@@ -0,0 +1,14 @@
+#PBL preamble and RCW header
+aa55aa55 01ee0100
+
+#enable IFC, disable QSPI and DSPI
+0608000a 00000000 00000000 00000000
+60000000 00407900 60040a00 21046000
+00000000 00000000 00000000 00038000
+00000000 001b7200 00000000 00000000
+
+#disable IFC, enable QSPI and DSPI
+#0608000a 00000000 00000000 00000000
+#60000000 00407900 60040a00 21046000
+#00000000 00000000 00000000 00038000
+#20024800 001b7200 00000000 00000000