[PATCH v4 2/2] imx: imxrt1050-evk: Add documentation for SPI boot

[Jesse Taube]

Add documentation for SPI boot.

Signed-off-by: Jesse Taube <Mr.Bossman075 at gmail.com>
---
V1 -> V2:
 - Change s/Adds/Add
 - Change imxrt1050-evk_spi to fspi
 - Fix spelling and grammar
 - Mention the SPI NOR flash part number
V2 -> V3:
 - No changes
V3 -> V4:
 - No changes
---
 doc/board/nxp/imxrt1050-evk.rst | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/doc/board/nxp/imxrt1050-evk.rst b/doc/board/nxp/imxrt1050-evk.rst
index c1fb48f0cd..e0cafe1035 100644
--- a/doc/board/nxp/imxrt1050-evk.rst
+++ b/doc/board/nxp/imxrt1050-evk.rst
@@ -39,3 +39,33 @@ switch label numbers reference).
   The USB console connector is the one close the ethernet connector
 
 - Insert the micro SD card in the board, power it up and U-Boot messages should come up.
+
+
+How to use U-Boot with SPI flash on NXP i.MXRT1050 EVK
+------------------------------------------------------
+
+- Build U-Boot for i.MXRT1050 EVK:
+
+.. code-block:: bash
+
+   $ make mrproper
+   $ make imxrt1050-evk_fspi_defconfig
+   $ make
+
+This will generate SPL, uboot.img, fspi_header.bin, and the final image (flash.bin).
+
+To boot from SPI flash on other boards, you may need to change the flash header config,
+which is specific to your flash chip, in Kconfig.
+The flash config is 4K in size and is documented on page 217 of the imxrt1050 RM.
+The default flash chip on the i.MXRT1050 EVK is the S26KS512SDPBHI02 HYPERFLASH.
+
+- Jumper settings::
+
+   SW7: 0 1 1 0
+
+where 0 means bottom position and 1 means top position (from the
+switch label numbers reference).
+
+- Connect the USB cable between the EVK and the PC for the console.
+
+- Use either JTAG or SWD to write `flash.bin` to the NOR. I used Mcuexpresso IDE's GUI flash tool.
-- 
2.43.0