doc: boards: amlogic: update documentation for ODROID-N2L

Improve documentation.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-20-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

doc/board/amlogic/odroid-n2l.rst

@@ -1,22 +1,23 @@
 .. SPDX-License-Identifier: GPL-2.0+
 
-U-Boot for ODROID-N2L
-=====================
+U-Boot for ODROID-N2L (S922X)
+=============================
 
-ODROID-N2L is a single board computer manufactured by Hardkernel
-Co. Ltd with the following specifications:
+ODROID-N2L is a Single Board Computer manufactured by Hardkernel with the following
+specifications:
 
  - Amlogic S922X ARM Cortex-A53 dual-core + Cortex-A73 quad-core SoC
  - 4GB DDR4 SDRAM
  - HDMI 2.1 4K/60Hz display
  - 40-pin GPIO header
- - 1 x USB 3.0 Host, 1 x USB USB 2.0 Host
+ - 1x USB 3.0 Host
+ - 1x USB 2.0 Host
  - eMMC, microSD
  - MIPI DSI Port
 
-Schematics are available on the manufacturer website.
+Schematics are available on the manufacturer website: https://wiki.odroid.com
 
-U-Boot compilation
+U-Boot Compilation
 ------------------
 
 .. code-block:: bash
@@ -25,7 +26,20 @@ U-Boot compilation
     $ make odroid-n2l_defconfig
     $ make
 
-Image creation
---------------
+U-Boot Signing with Pre-Built FIP repo
+--------------------------------------
 
-For simplified usage, pleaser refer to :doc:`pre-generated-fip` with codename `odroid-n2l`
+.. code-block:: bash
+
+    $ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
+    $ cd amlogic-boot-fip
+    $ mkdir my-output-dir
+    $ ./build-fip.sh odroid-n2l /path/to/u-boot/u-boot.bin my-output-dir
+
+Then write U-Boot to SD or eMMC with:
+
+.. code-block:: bash
+
+    $ DEV=/dev/boot_device
+    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
+    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440