feat(u-boot): Add documentation of Ethernet boot for J784s4 SoC

Ethernet boot support has been added to J784s4 SoC, add documentation for
the same.

Signed-off-by: Chintan Vankar <[email protected]>

Author: chintanv133

configs/AM69/AM69_linux_config.txt

@@ -32,6 +32,10 @@ Replacement Variables
 '__PCIE_BASE_ADDRESS__'          : '2900000'
 '__PCIE_DEVICE_ID__'             : '0xb00d'
 '__IMAGE_TYPE__'                 : 'default'
+'__SPL_VCI_STRING_LEN__'         : '18'
+'__SPL_VCI_STRING__'             : 'AM69 U-Boot R5 SPL'
+'__UBOOT_VCI_STRING_LEN__'       : '19'
+'__UBOOT_VCI_STRING__'           : 'AM69 U-Boot A72 SPL'
 
 Configuration Values
 --------------------

configs/AM69/AM69_linux_toc.txt

@@ -31,6 +31,7 @@ linux/Foundational_Components/U-Boot/UG-UART
 linux/Foundational_Components/U-Boot/UG-SATA
 linux/Foundational_Components/U-Boot/UG-UFS
 linux/Foundational_Components/U-Boot/UG-DDRSS-J7
+linux/Foundational_Components/U-Boot/UG-Network-K3
 linux/Foundational_Components/U-Boot/UG-HyperBus
 linux/Foundational_Components/U-Boot/UG-RemoteProc
 linux/Foundational_Components/U-Boot/UG-HSM

source/linux/Foundational_Components/U-Boot/UG-General-Info.rst

@@ -372,15 +372,15 @@ Build U-Boot
 
    .. ifconfig:: CONFIG_part_variant in ('J784S4')
 
-      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+
-      |  Board                     |            SD/eMMC Boot         |           UART boot            |           OSPI boot            |           USB DFU              |
-      +============================+=================================+================================+================================+================================+
-      |    J784S4 EVM              |    j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |
-      |                            |    j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |
-      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+
-      |    AM69 HS-FS SK           |    j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |                                |
-      |                            |    j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |                                |
-      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+
+      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+--------------------------------------+
+      |  Board                     |            SD/eMMC Boot         |           UART boot            |           OSPI boot            |           USB DFU              |           Ethernet boot              |
+      +============================+=================================+================================+================================+================================+======================================+
+      |    J784S4 EVM              |    j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |                                      |
+      |                            |    j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |                                      |
+      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+--------------------------------------+
+      |    AM69 HS-FS SK           |    j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |   j784s4\_evm\_r5\_defconfig   |                                |   am69\_sk\_r5\_ethboot\_defconfig   |
+      |                            |    j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |   j784s4\_evm\_a72\_defconfig  |                                |   am69\_sk\_a72\_ethboot\_defconfig  |
+      +----------------------------+---------------------------------+--------------------------------+--------------------------------+--------------------------------+--------------------------------------+
 
    .. ifconfig:: CONFIG_part_variant in ('J742S2')
 

source/linux/Foundational_Components/U-Boot/UG-Network-K3.rst

@@ -70,7 +70,15 @@ binaries files to be sent over TFTP are listed in the table below.
 
       - Ethernet RGMII boot is supported over RGMII on J721S2 SoC.
 
-.. ifconfig:: CONFIG_part_variant in ('AM64X','AM62X','J722S','AM62PX','J721S2')
+.. ifconfig:: CONFIG_part_variant in ('J784S4')
+
+   Build tiboot3.bin using ``am69_evm_r5_ethboot_defconfig``. Build tispl.bin and u-boot.img using ``am69_evm_a72_ethboot_defconfig``.
+
+   .. important::
+
+      - Ethernet RGMII boot is supported over RGMII on J784S4 SoC.
+
+.. ifconfig:: CONFIG_part_variant in ('AM64X','AM62X','J722S','AM62PX','J721S2','J784S4')
 
    If using ISC dhcpd an example host entry would look like this: