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source: linux: Add documentation of Ethernet boot for J722S
Ethernet boot support has been added to J722s SoC, add documentation for the same. Signed-off-by: Chintan Vankar <[email protected]>
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‎configs/J722S/J722S_linux_toc.txt

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@@ -33,6 +33,7 @@ linux/Foundational_Components/U-Boot/UG-NOR
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linux/Foundational_Components/U-Boot/UG-UART
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linux/Foundational_Components/U-Boot/UG-SATA
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linux/Foundational_Components/U-Boot/UG-DDRSS-J7
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linux/Foundational_Components/U-Boot/UG-Network-K3
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linux/Foundational_Components/U-Boot/UG-HyperBus
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linux/Foundational_Components/U-Boot/UG-RemoteProc
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linux/Foundational_Components/U-Boot/Applications

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

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@@ -391,12 +391,12 @@ Build U-Boot
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.. ifconfig:: CONFIG_part_variant in ('J722S')
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+----------------------------+---------------------------------+--------------------------------+--------------------------------+------------------------------------+------------------------------------+
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| Board | SD/eMMC Boot | UART boot | OSPI boot | USB DFU | USB MSC |
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+============================+=================================+================================+================================+====================================+====================================+
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| J722S EVM | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_usbdfu.config | j722s\_evm\_r5\_usbmsc.config |
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| | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig |
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+----------------------------+---------------------------------+--------------------------------+--------------------------------+------------------------------------+------------------------------------+
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+----------------------------+---------------------------------+--------------------------------+--------------------------------+------------------------------------+------------------------------------+------------------------------------------+
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| Board | SD/eMMC Boot | UART boot | OSPI boot | USB DFU | USB MSC | Ethernet Boot |
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+============================+=================================+================================+================================+====================================+====================================+==========================================+
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| J722S EVM | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_defconfig | j722s\_evm\_r5\_usbdfu.config | j722s\_evm\_r5\_usbmsc.config | j722s\_evm\_r5\_ethboot\_defconfig |
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| | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_defconfig | j722s\_evm\_a53\_ethboot\_defconfig |
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+----------------------------+---------------------------------+--------------------------------+--------------------------------+------------------------------------+------------------------------------+------------------------------------------+
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.. ifconfig:: CONFIG_part_variant in ('J721E','J7200','J721S2','J784S4','J742S2')
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‎source/linux/Foundational_Components/U-Boot/UG-Network-K3.rst

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@@ -26,6 +26,8 @@ binaries files to be sent over TFTP are listed in the table below.
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| | ``am64x_evm_a53_defconfig`` | | :file:`tiboot3.bin` | :file:`tispl.bin` | :file:`u-boot.img` |
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+------------------+------------------------------+------------------------+------------------------+---------------------------+---------------------------+
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For instructions to build the bootloader images please refer to :ref:`Build-U-Boot-label`.
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.. important::
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- Ethernet RGMII boot is supported over RGMII2 (Second port) on AM64x SoC.
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- Disable link info Bootmode pin so that ROM can identify the PHY and establishes link with the supported speed and duplex mode.
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- Please note that due to MDIO corruption (Errata i2329), booting over Ethernet is not recommended for production purposes.
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.. ifconfig:: CONFIG_part_variant in ('J722S')
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+------------------+--------------------------------------+-----------------------+------------------------+---------------------------+----------------------------+
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| Board | Defconfigs | Supported interfaces | ROM | R5 SPL | A53 SPL |
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+==================+======================================+=======================+========================+===========================+============================+
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| J722s EVM | ``j722s_evm_r5_ethboot_defconfig`` | CPSW NUSS Ethernet | VCI: TI K3 Bootp Boot | VCI: J722S U-Boot R5 SPL | VCI: J722S U-Boot A53 SPL |
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| | ``j722s_evm_a53_ethboot_defconfig`` | | :file:`tiboot3.bin` | :file:`tispl.bin` | :file:`u-boot.img` |
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+------------------+--------------------------------------+-----------------------+------------------------+---------------------------+----------------------------+
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Build tiboot3.bin using ``j722s_evm_r5_ethboot_defconfig``. Build tispl.bin and u-boot.img using ``j722s_evm_a53_ethboot_defconfig``. For instructions to build the bootloader images please refer to :ref:`Build-U-Boot-label`.
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.. important::
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- Ethernet RGMII boot is supported over RGMII on J722s SoC.
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- CPSW PHYs should be strapped as per ROM's expectation described in part's TRM.
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- When the link info Bootmode pin is enabled, this means no auto-negotiation or reading of the Ethernet PHY is needed since the ROM will assume the link is up at 1Gbps, full duplex mode.
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- Disable link info Bootmode pin so that ROM can identify the PHY and establishes link with the supported speed and duplex mode.
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.. ifconfig:: CONFIG_part_variant in ('AM64X')
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If using ISC dhcpd an example host entry would look like this:
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next-server 10.0.0.1;
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}
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.. ifconfig:: CONFIG_part_variant in ('J722S')
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If using ISC dhcpd an example host entry would look like this:
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.. code-block:: text
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subnet 10.0.0.0 netmask 255.0.0.0
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{
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range dynamic-bootp 10.0.0.2 10.0.0.16;
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if substring (option vendor-class-identifier, 0, 16) = "TI K3 Bootp Boot"
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{
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filename "tiboot3.bin";
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} elsif substring (option vendor-class-identifier, 0, 20) = "J722S U-Boot R5 SPL"
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{
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filename "tispl.bin";
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} elsif substring (option vendor-class-identifier, 0, 21) = "J722S U-Boot A53 SPL"
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{
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filename "u-boot.img";
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}
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range 10.0.0.17 10.0.0.25;
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default-lease-time 60000;
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max-lease-time 720000;
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next-server 10.0.0.1;
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}
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A walk through of these steps to setup isc-dhcp-server on Ubuntu can be found at `here
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<https://help.ubuntu.com/community/isc-dhcp-server>`__.

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