feat(linux): U-Boot: Falcon-Mode: Add AM62d support

This patch documents falcon-mode for AM62d EVM, the upstream
documentation is on v2026.04 instead of v2026.01 unlike other platforms
since AM62d's docs were not updated upstream until v2026.04 release of
U-Boot.

Signed-off-by: Anshul Dalal <anshuld@ti.com>

Author: ArchUsr64

configs/AM62DX/AM62DX_linux_toc.txt

@@ -38,6 +38,7 @@ linux/Foundational_Components/U-Boot/UG-UMS
 linux/Foundational_Components/U-Boot/UG-QSPI
 linux/Foundational_Components/U-Boot/UG-UART
 linux/Foundational_Components/U-Boot/UG-RemoteProc
+linux/Foundational_Components/U-Boot/UG-Falcon-Mode
 
 linux/Foundational_Components/U-Boot/Applications
 linux/Foundational_Components/U-Boot/Apps-SPL-Debug-OpenOCD

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

@@ -22,6 +22,10 @@ The following steps show how to build R5 SPL with falcon mode support:
 
    * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/v2026.01/board/ti/am62ax_sk.html#falcon-mode>`__
 
+.. ifconfig:: CONFIG_part_variant in ('AM62DX')
+
+   * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/v2026.04/board/ti/am62dx_evm.html#falcon-mode>`__
+
 .. ifconfig:: CONFIG_part_variant in ('AM62PX')
 
    * `Falcon Mode - U-Boot documentaiton <https://docs.u-boot.org/en/v2026.01/board/ti/am62px_sk.html#falcon-mode>`__
@@ -60,7 +64,7 @@ Extra Configuration
 OSPI boot:
 ==========
 
-.. ifconfig:: CONFIG_part_variant not in ('AM62AX')
+.. ifconfig:: CONFIG_part_variant not in ('AM62AX', 'AM62DX')
 
    For OSPI boot, the :file:`tiboot3.bin` file should be flashed to the same
    addresses in flash as regular boot flow whereas :file:`tifalcon.bin` and the
@@ -76,7 +80,7 @@ OSPI boot:
      => tftp ${loadaddr} tiboot3.bin
      => sf update $loadaddr 0x0 $filesize
 
-.. ifconfig:: CONFIG_part_variant in ('AM62AX')
+.. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62DX')
 
    This section is not applicable for this platform.