[U-Boot] [PATCH] board/ls2080qds: add the procedure to deply QSPI image.

[Yuan Yao <yao.yuan@freescale.com>]

From: Yuan Yao <yao.yuan@nxp.com>

Signed-off-by: Yuan Yao <yao.yuan@nxp.com>
---
 board/freescale/ls2080aqds/README | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/board/freescale/ls2080aqds/README b/board/freescale/ls2080aqds/README
index f288750..0f7446a 100644
--- a/board/freescale/ls2080aqds/README
+++ b/board/freescale/ls2080aqds/README
@@ -188,3 +188,38 @@ DPMAC14 -> PHY4-P1
 DPMAC15 -> PHY4-P2
 DPMAC16 -> PHY4-P3
 
+
+Booting from QSPI
+-------------------
+Booting from QSPI requires two images, RCW and u-boot-dtb.bin.
+The difference between QSPI boot RCW image and NOR boot image is the PBI
+command sequence. Below is the setting for PBI commands for QDS which boot
+on QSPI flash device.
+
+1) CCSR 4-byte write to 0x00e00404, data=0x00000000
+2) CCSR 4-byte write to 0x00e00400, data=0x20010000
+The above two commands set bootloc register to 0x00000000_20010000 where
+the u-boot code will be running in QSPI flash.
+
+RCW image should be written to the beginning of QSPI flash device.
+Example of using u-boot command
+
+=> sf probe 0:0
+SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB
+=> sf erase 0 +<size of rcw image>
+SF: 65536 bytes @ 0x0 Erased: OK
+=> sf write <rcw image in memory> 0 <size of rcw image>
+SF: 164 bytes @ 0x0 Written: OK
+
+To get the QSPI image, build u-boot with QSPI config, for example,
+ls2080aqds_qspi_defconfig. The image needed is u-boot-dtb.bin.
+The u-boot image should be written to 0x10000.
+
+=> sf probe 0:0
+SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB
+=> sf erase 10000 +<size of u-boot image>
+SF: 589824 bytes @ 0x10000 Erased: OK
+=> sf write <u-boot image in memory> 10000 <size of u-boot image>
+SF: 580966 bytes @ 0x10000 Written: OK
+
+With these two images in QSPI flash device, the board can boot from QSPI.
-- 
2.1.0.27.g96db324