feat(Falcon-Mode): update to use upstream U-Boot docs

With falcon mode support from the R5 SPL documented in upstream U-Boot
at commit 489ec1ee14a8 ("doc: ti: document R5 falcon mode for AM62
platforms")[1]. Some sections of the SDK docs can be replaced with a
hyperlink to the upstream U-Boot documentation.

[1]: u-boot/u-boot@489ec1e

Signed-off-by: Anshul Dalal <[email protected]>

Author: ArchUsr64

source/linux/Foundational_Components/U-Boot/UG-Falcon-Mode.rst

@@ -150,118 +150,36 @@ For more information check: :ref:`How to flash eMMC and boot with eMMC Boot
 Custom fitImage creation:
 =========================
 
-Clone the `core-secdev-k3 source <https://git.ti.com/cgit/security-development-tools/core-secdev-k3>`__:
+The following steps show how to create a falcon compatible :file:`fitImage`:
 
-.. code-block:: console
-
-   $ git clone https://git.ti.com/cgit/security-development-tools/core-secdev-k3
-
-Copy the required kernel image renamed to :file:`Image` and the device-tree
-renamed to :file:`falcon.dtb` inside the `core-secdev-k3` source directory.
-
-Copy the following contents to a file named :file:`fitImage.its` inside
-core-secdev-k3 source:
-
-.. code-block:: dts
-
-   /dts-v1/;
-
-   / {
-       description = "Kernel fitImage for falcon mode";
-       #address-cells = <1>;
-
-       images {
-           kernel-1 {
-               description = "Linux kernel";
-               data = /incbin/("Image.sec");
-               type = "kernel";
-               arch = "arm64";
-               os = "linux";
-               compression = "none";
-               load = <0x82000000>;
-               entry = <0x82000000>;
-           };
-           falcon.dtb {
-               description = "Flattened Device Tree blob";
-               data = /incbin/("falcon.dtb.sec");
-               type = "flat_dt";
-               arch = "arm64";
-               compression = "none";
-               load = <0x88000000>;
-               entry = <0x88000000>;
-           };
-       };
-
-       configurations {
-           default = "conf-falcon";
-           conf-falcon {
-               description = "Presigned Linux kernel and DTB";
-               kernel = "kernel-1";
-               fdt = "falcon.dtb";
-           };
-       };
-   };
-
-Sign the kernel and device-tree with :file:`secure-binary-image.sh` and create the
-:file:`fitImage` by using ``mkimage``:
-
-.. code-block:: console
-
-   $ # inside core-secdev-k3 source
-   $ ./scripts/secure-binary-image.sh Image Image.sec
-   $ ./scripts/secure-binary-image.sh falcon.dtb falcon.dtb.sec
-   $ mkimage -f fitImage.its fitImage
+.. ifconfig:: CONFIG_part_variant in ('AM62AX')
 
-****************
-Non-Yocto Users:
-****************
+   * `fitImage Creation - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62ax_sk.html#fitimage>`__
 
-Following are the steps to build :file:`tiboot3.bin`, :file:`tifalcon.bin` and the
-:file:`fitImage` required for falcon mode:
+.. ifconfig:: CONFIG_part_variant in ('AM62PX')
 
-#. For :ref:`ATF build <foundational-components-atf>`, use the following
-   arguments to update the ATF's jump address for the kernel and the
-   device-tree: ``PRELOADED_BL33_BASE=0x82000000 K3_HW_CONFIG_BASE=0x88000000``.
+   * `fitImage Creation - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62px_sk.html#fitimage>`__
 
-#. For :ref:`R5 U-Boot build <Build-U-Boot-label>`, use the
-   :file:`k3_r5_falcon.config` fragment to enable flacon support at the R5 SPL
-   stage.
+.. ifconfig:: CONFIG_part_variant in ('AM62X')
 
-#. Refer to the :ref:`fitImage creation step
-   <u-boot_falcon_mode_fitImage_creation>` above for preparing a bootable
-   :file:`fitImage` with an appropriate kernel and device-tree.
+   * `fitImage Creation - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62x_sk.html#fitimage>`__
 
-#. Copy the files generated to correct path on SD/eMMC as in the table below:
+Non-Yocto Users:
+================
 
-   .. list-table::
-      :widths: 8 8 8 25
-      :header-rows: 1
+The following steps show how to enable falcon mode from the R5 SPL standalone:
 
-      * - File
-        - Destination path on SD/eMMC
-        - Partition
-        - Description
+.. ifconfig:: CONFIG_part_variant in ('AM62AX')
 
-      * - :file:`tiboot3.bin`
-        - :file:`/tiboot3.bin`
-        - boot (fat)
-        - R5 SPL with falcon support
+   * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62ax_sk.html#falcon-mode>`__
 
-      * - :file:`tifalcon.bin`
-        - :file:`/boot/tifalcon.bin`
-        - root filesystem (ext4)
-        - tispl binary without SPL for the A core and device-tree
+.. ifconfig:: CONFIG_part_variant in ('AM62PX')
 
-      * - :file:`fitImage`
-        - :file:`/boot/fitImage`
-        - root filesystem (ext4)
-        - :file:`fitImage` with pre-signed kernel and device-tree
+   * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62px_sk.html#falcon-mode>`__
 
-.. note::
+.. ifconfig:: CONFIG_part_variant in ('AM62X')
 
-   The :file:`tifalcon.bin` binary is generated by default for all falcon
-   supported platforms at the A-Core U-Boot build step and can be found
-   alongside the existing :file:`tispl.bin` file in U-Boot build's output directory.
+   * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/latest/board/ti/am62x_sk.html#falcon-mode>`__
 
 **********************
 Boot time comparisons: