[PATCH v2 7/7] doc: board: nxp: Add instructions to boot from QSPI

[Mamta Shukla]

Add instructions to build and boot from  QSPI Flash.

Signed-off-by: Mamta Shukla <mamta.shukla at leica-geosystems.com>
Signed-off-by: Thomas Haemmerle <thomas.haemmerle at leica-geosystems.com>
---
 doc/board/nxp/imx8mm_evk.rst | 38 ++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/doc/board/nxp/imx8mm_evk.rst b/doc/board/nxp/imx8mm_evk.rst
index b9e67b954f..ea7153a69b 100644
--- a/doc/board/nxp/imx8mm_evk.rst
+++ b/doc/board/nxp/imx8mm_evk.rst
@@ -35,8 +35,8 @@ Get the ddr firmware
    $ ./firmware-imx-8.9
    $ cp firmware-imx-8.9/firmware/ddr/synopsys/lpddr4*.bin $(builddir)
 
-Build U-Boot
-------------
+Build U-Boot for sd card
+--------------------------
 
 .. code-block:: bash
 
@@ -53,3 +53,37 @@ Burn the flash.bin to MicroSD card offset 33KB:
 Boot
 ----
 Set Boot switch to SD boot
+
+Build U-Boot for qspi flash  card
+------------------------------------
+
+.. code-block:: bash
+
+   $ export CROSS_COMPILE=aarch64-poky-linux-
+   $ make imx8mm_evk_fspi_defconfig
+   $ make
+
+Currently, there is no direct support to write to QSPI Flash.
+Copy flash.bin to ${loadaddr} either from sd card or over network and then copy to
+qspi flash 
+
+From sd card to memory
+
+.. code-block:: bash
+    
+    $mmc dev 1
+    $mmc read ${loadaddr} 0x00 <size_of_flash.bin/512>
+
+.. code-block:: bash
+
+   $ sf probe
+   $ sf erase 0 <size_of_flash.bin_in_hex>
+   $ sf write $loadaddr 0x00 <size_of_flash.bin_in_hex>
+   
+Boot from QSPI Flash
+-----------------------
+Set Boot Switch to QSPI Flash
+
+Pin configuration for imx8mm_revC evk to boot from qspi flash
+SW1101: 0110xxxxxx
+SW1102: 00100x0010
-- 
2.25.1