fix(snagboot): update snagboot documentation.

add the comprehensive procedure for using snagboot
along with sample configurations.

Signed-off-by: sadik <s-sadik@ti.com>

Author: sadik-smd

source/images/snagfactory.png

@@ -22,13 +22,20 @@ Installing Snagfactory
 * More info about installation can be found in `Snagfactory Readme <https://github.com/bootlin/snagboot/blob/main/README.md>`__.
 * Snagfactory also is available on pip.
 
- .. code-block:: console
+.. code-block:: console
 
-    $ python3 -m pip install --user snagboot
+   $ python3 -m pip install --user snagboot
+   $ python3 -m pip install --user snagboot[gui]
 
 .. note::
 
-   At the time of 11.0 release, the corresponding Snagfactory version was v2.2.
+   At the time of 11.1 release, the corresponding Snagfactory version was v2.3.
+
+.. ifconfig:: CONFIG_part_variant in ('AM62DX')
+
+    .. note::
+
+        AM62DX support was added after v2.3. Refer this `commit <https://github.com/bootlin/snagboot/commit/d5a691b1916207ee674e99620c63cc3a6c3b3a28>`__.
 
 *****************************************
 Building bootloader binaries for Recovery
@@ -87,6 +94,14 @@ in :file:`Rules.make` file present in the top level of Linux SDK Installer.
 
       BOOT_MACHINE_A53=am62px_evm_a53_defconfig am62x_a53_usbdfu.config am6x_a53_snagfactory.config
 
+.. ifconfig:: CONFIG_part_variant in ('AM62DX')
+
+   .. code-block:: make
+
+      UBOOT_MACHINE_R5=am62dx_evm_r5_defconfig am62x_r5_usbdfu.config
+
+      BOOT_MACHINE_A53=am62dx_evm_a53_defconfig am62x_a53_usbdfu.config am6x_a53_snagfactory.config
+
 Generate the bootloader images using top-level makefile by running following
 commands on the terminal from the top-level of the Linux SDK installer.
 
@@ -115,18 +130,208 @@ Connections
 
 * Power off the EVM and set up the boot mode switches to boot from USB DFU.
 
- .. code-block:: text
+.. code-block:: text
 
-    SW2-11001100
-    SW3-00000000
+   SW2-11001100
+   SW3-00000000
 
 * Power on the board.
 * Optionally you can also connect host PC to board via UART to read the console logs.
 
 How to use Snagfactory
 **********************
 
-Comprehensive instructions for using the Snagfactory tool can be found here.
+Comprehensive instructions for installation of the Snagfactory tool can be found here.
 
 * `Snagfactory doc <https://github.com/bootlin/snagboot/blob/main/docs/snagfactory.md>`__.
 * `Snagfactory config doc <https://github.com/bootlin/snagboot/blob/main/docs/snagfactory_config.md>`__.
+
+
+**SnagFactory GUI Tool Configuration and Device Flashing Procedure**
+
+The tool currently supports MMC and MTD backends for flashing images.
+
+.. note::
+
+   SnagFactory GUI tool is a prerequisite for this procedure.
+
+The following steps outline the process for configuring and flashing a device by using
+the SnagFactory GUI tool.
+
+.. figure:: /images/snagfactory.png
+   :height: 500
+   :width: 800
+
+**Step 1: Launch SnagFactory GUI Tool**
+
+* Launch the SnagFactory GUI tool to begin the configuration and device flashing process.
+
+.. code-block:: console
+
+   $ snagfactory
+
+**Step 2: Select Configuration File Option**
+
+* Upon launch, the SnagFactory GUI tool will present the option to add a configuration file.
+  Select the conf option to proceed with loading the configuration file.
+
+**Step 3: Load YAML Configuration File**
+
+* Load the YAML configuration file for the platform. This file has the necessary settings
+  and parameters for the device flashing process.
+
+**Step 4: Flash the Device**
+
+* Once you load the YAML configuration file, the SnagFactory GUI tool will flash the device with
+  the specified configuration.
+
+
+
+The example configuration files for **emmc** and **ospi-nand** and **ospi-nor** are as follows.
+
+For reference, the :file:`ospi-nor.yaml` file for **am62p** platform can be as follows:
+
+.. code-block:: text
+
+   boards:
+     0451:6165: am62p
+   soc-models:
+     am62p-firmware:
+       tiboot3:
+         path: "<path_to_boot_binaries>/tiboot3.bin"
+       tispl:
+         path: "<path_to_boot_binaries>/tispl.bin"
+       u-boot:
+         path: "<path_to_boot_binaries>/u-boot.img"
+     am62p-tasks:
+     - eraseblk-size: 0x40000
+       fb-buffer-addr: 0x82000000
+       fb-buffer-size: 0x7000000
+       target-device: nor0
+     - task: run
+       args:
+         - "oem_run:mtd list"
+         - "oem_run:setenv mtdids nor0=nor0"
+     - task: mtd-parts
+       args:
+         - name: ospi.tiboot3
+           size: 0x80000
+         - name: ospi.tispl
+           size: 0x200000
+         - name: ospi.u-boot
+           size: 0x400000
+     - task: flash
+       args:
+         - image: "<path_to_flash_binaries>/tiboot3.bin"
+           part: ospi.tiboot3
+         - image: "<path_to_flash_binaries>/tispl.bin"
+           part: ospi.tispl
+         - image: "<path_to_flash_binaries>/u-boot.img"
+           part: ospi.u-boot
+
+For reference, the :file:`ospi-nand.yaml` file for **am62xx-lp** platform can be as follows:
+
+.. code-block:: text
+
+   boards:
+     0451:6165: am625
+   soc-models:
+     am625-firmware:
+       tiboot3:
+         path: "<path_to_boot_binaries>/tiboot3.bin"
+       tispl:
+         path: "<path_to_boot_binaries>/tispl.bin"
+       u-boot:
+         path: "<path_to_boot_binaries>/u-boot.img"
+     am625-tasks:
+     - eraseblk-size: 0x40000
+       fb-buffer-addr: 0x82000000
+       fb-buffer-size: 0x7000000
+       target-device: spi-nand0
+     - task: run
+       args:
+         - "oem_run:mtd list"
+         - "oem_run:setenv mtdids spi-nand0=spi-nand0"
+     - task: mtd-parts
+       args:
+         - name: ospi_nand.tiboot3
+           size: 0x80000
+         - name: ospi_nand.tispl
+           size: 0x200000
+         - name: ospi_nand.u-boot
+           size: 0x400000
+         - name: ospi_nand.env
+           size: 0x40000
+         - name: ospi_nand.env.backup
+           size: 0x40000
+         - name: ospi_nand.rootfs
+           size: 0x5fc0000
+           start: 0x2000000
+         - name: ospi_nand.phypattern
+           start: 0x7fc0000
+           size: 0x40000
+     - task: flash
+       args:
+         - image: "<path_to_flash_binaries>/tiboot3.bin"
+           part: ospi_nand.tiboot3
+         - image: "<path_to_flash_binaries>/tispl.bin"
+           part: ospi_nand.tispl
+         - image: "<path_to_flash_binaries>/u-boot.img"
+           part: ospi_nand.u-boot
+
+For reference, the  :file:`emmc.yaml` file for **am62p** platform can be as follows:
+
+.. code-block:: text
+
+   boards:
+     "0451:6165": "am62p"
+   soc-models:
+     am62p-firmware:
+         tiboot3:
+           path: "<path_to_boot_binaries>/tiboot3.bin"
+         tispl:
+           path: "<path_to_boot_binaries>/tispl.bin"
+         u-boot:
+           path: "<path_to_boot_binaries>/u-boot.img"
+     am62p-tasks:
+       - target-device: mmc0
+         fb-buffer-addr: 0x82000000
+         fb-buffer-size: 0x7000000
+       - task: gpt
+         args:
+           - name: rootfs
+             size: 1G
+       - task: reset
+       - task: flash
+         args:
+           - image: "<path_to_flash_binaries>/tiboot3.bin"
+             image-offset: 0x0
+             part: "hwpart 1"
+           - image: "<path_to_flash_binaries>/tispl.bin"
+             image-offset: 0x80000
+             part: "hwpart 1"
+           - image: "<path_to_flash_binaries>/u-boot.img"
+             image-offset: 0x280000
+             part: "hwpart 1"
+           - image: "<path_to_flash_binaries>/rootfs.ext4"
+             part: "rootfs"
+
+**Snagboot Commandline Configuration and Device Flashing Procedure**
+
+Snagrecover uses vendor-specific ROM code mechanisms to initialize external RAM and run U-Boot, without modifying any non-volatile memories.
+
+.. code-block:: console
+
+   $ snagrecover -s am625 -F "{'tiboot3': {'path': 'tiboot3.bin'}}" -F "{'tispl': {'path': 'tispl.bin'}}" -F "{'u-boot': {'path': 'u-boot.img'}}"
+
+* Comprehensive instructions for using snagrecover command line can be accessed at
+  `Snagrecover command line <https://github.com/bootlin/snagboot/blob/main/docs/snagrecover.md>`__.
+
+Snagflash communicates with U-Boot to flash system images to non-volatile memories, using either DFU, UMS or Fastboot.
+
+.. code-block:: console
+
+   $ snagflash -P fastboot-uboot -p 0451:6165 -i
+
+* Comprehensive instructions for using snagflash command line can be accessed at
+  `Snagflash command line <https://github.com/bootlin/snagboot/blob/main/docs/snagflash.md>`__.