armv8: ls2080aqds: Add support for SD boot

Signed-off-by: Santan Kumar <santan.kumar@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Signed-off-by: Abhimanyu Saini <abhimanyu.saini@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls2080aqds/README b/board/freescale/ls2080aqds/README
index cad860e..8e31e9e 100644
--- a/board/freescale/ls2080aqds/README
+++ b/board/freescale/ls2080aqds/README
@@ -102,6 +102,19 @@
 DPAA2 DPC			0x00E00000
 Kernel.itb			0x01000000
 
+Memory map for SD boot
+-------------------------
+Image				Flash Offset	SD Card
+						Start Block No.
+RCW+PBI				0x00000000	0x00008
+Boot firmware (U-Boot)		0x00100000	0x00800
+Boot firmware Environment	0x00300000	0x01800
+PPA firmware			0x00400000	0x02000
+DPAA2 MC			0x00A00000	0x05000
+DPAA2 DPL			0x00D00000	0x06800
+DPAA2 DPC			0x00E00000	0x07000
+Kernel.itb			0x01000000	0x08000
+
 Environment Variables
 ---------------------
 - mcboottimeout: MC boot timeout in milliseconds. If this variable is not defined