doc: boards: amlogic: update documentation for JetHub J80

Improve documentation.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-8-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

diff --git a/doc/board/amlogic/jethub-j80.rst b/doc/board/amlogic/jethub-j80.rst
index f669a0118dc23c9579b53d52dca846b8f5f90a6b..9195df690502056d7455996564555b660bed9227 100644 (file)
--- a/doc/board/amlogic/jethub-j80.rst
+++ b/doc/board/amlogic/jethub-j80.rst
@@ -1,10 +1,10 @@
 .. SPDX-License-Identifier: GPL-2.0+
 
-U-Boot for JetHub J80
-======================
+U-Boot for JetHub J80 (S905W)
+=============================
 
-JetHome Jethub H1 (http://jethome.ru/jethub-h1) is a home automation
-controller manufactured by JetHome with the following specifications:
+JetHome Jethub H1 (http://jethome.ru/jethub-h1) is a home automation controller device
+manufactured by JetHome with the following specifications:
 
  - Amlogic S905W (ARM Cortex-A53) quad-core up to 1.5GHz
  - No video out
@@ -21,7 +21,7 @@ controller manufactured by JetHome with the following specifications:
  - DC source 5V microUSB
  - Square plastic case
 
-U-Boot compilation
+U-Boot Compilation
 ------------------
 
 .. code-block:: bash
@@ -30,14 +30,21 @@ U-Boot compilation
     $ make jethub_j80_defconfig
     $ make
 
-Image creation
---------------
+U-Boot Signing with Pre-Built FIP repo
+--------------------------------------
 
-For simplified usage, pleaser refer to :doc:`pre-generated-fip` with codename `jethub-j80`
+.. 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 jethub-j80 /path/to/u-boot/u-boot.bin my-output-dir
+
+U-Boot Manual Signing
+---------------------
 
-Amlogic doesn't provide sources for the firmware and for tools needed
-to create the bootloader image, so it is necessary to obtain binaries
-from the git tree published by the board vendor:
+Amlogic does not provide sources for the firmware and tools needed to create a bootloader
+image so it is necessary to obtain binaries from sources published by the board vendor:
 
 .. code-block:: bash
 
@@ -45,7 +52,7 @@ from the git tree published by the board vendor:
     $ cd jethub-u-boot
     $ export FIPDIR=$PWD
 
-Go back to mainline U-Boot source tree then :
+Go back to the mainline U-Boot source tree then:
 
 .. code-block:: bash
 
@@ -84,16 +91,16 @@ Go back to mainline U-Boot source tree then :
     $ $FIPDIR/j80/aml_encrypt_gxl --bl3enc --input fip/bl33.bin --compress lz4
     $ $FIPDIR/j80/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
     $ $FIPDIR/j80/aml_encrypt_gxl --bootmk \
-                --output fip/u-boot.bin \
-                --bl2 fip/bl2.n.bin.sig \
-                --bl30 fip/bl30_new.bin.enc \
-                --bl31 fip/bl31.img.enc \
-                --bl33 fip/bl33.bin.enc
+                                  --output fip/u-boot.bin \
+                                  --bl2 fip/bl2.n.bin.sig \
+                                  --bl30 fip/bl30_new.bin.enc \
+                                  --bl31 fip/bl31.img.enc \
+                                  --bl33 fip/bl33.bin.enc
 
-and then write the image to SD/eMMC with:
+Then write U-Boot to SD or eMMC with:
 
 .. code-block:: bash
 
-    $ DEV=/dev/your_sd_device
+    $ 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=444
+    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440