--- /dev/null
+.. SPDX-License-Identifier: GPL-2.0+
+
+Pine64 Star64
+=============
+
+U-Boot for the Star64 uses the same U-Boot binaries as the VisionFive 2 board.
+In U-Boot SPL the actual board is detected and the device-tree patched
+accordingly.
+
+Building
+~~~~~~~~
+
+1. Add the RISC-V toolchain to your PATH.
+2. Setup ARCH & cross compilation environment variable:
+
+.. code-block:: none
+
+ export CROSS_COMPILE=<riscv64 toolchain prefix>
+
+The M-mode software OpenSBI provides the supervisor binary interface (SBI) and
+is responsible for the switch to S-Mode. It is a prerequisite to build U-Boot.
+Support for the JH7110 was introduced in OpenSBI 1.2. It is recommended to use
+a current release.
+
+.. code-block:: console
+
+ git clone https://github.com/riscv/opensbi.git
+ cd opensbi
+ make PLATFORM=generic FW_TEXT_START=0x40000000
+
+Now build the U-Boot SPL and U-Boot proper.
+
+.. code-block:: console
+
+ cd <U-Boot-dir>
+ make starfive_visionfive2_defconfig
+ make OPENSBI=$(opensbi_dir)/build/platform/generic/firmware/fw_dynamic.bin
+
+This will generate the U-Boot SPL image (spl/u-boot-spl.bin.normal.out) as well
+as the FIT image (u-boot.itb) with OpenSBI and U-Boot.
+
+Device-tree selection
+~~~~~~~~~~~~~~~~~~~~~
+
+U-Boot will set variable $fdtfile to starfive/jh7110-pine64-star64.dtb.
+
+To overrule this selection the variable can be set manually and saved in the
+environment
+
+::
+
+ env set fdtfile my_device-tree.dtb
+ env save
+
+or the configuration variable CONFIG_DEFAULT_FDT_FILE can be used to set to
+provide a default value.
+
+Boot source selection
+~~~~~~~~~~~~~~~~~~~~~
+
+Boot mode is selected by an MSEL-DIP marked S1804 and GPIO_0 position adjacent
+to the 40pin GPIO header. ON/ONKE and number markings of the MSEL-DIP are
+misleading; Instead refer to the ``L`` (0) and ``H`` (1) silkscreen for
+accurate selection.
+
++ (QSPI) Flash: 00
++ SD: 01
++ EMMC: 10
++ UART: 11
+
+Preparing the SD-Card
+~~~~~~~~~~~~~~~~~~~~~
+
+The device firmware loads U-Boot SPL (u-boot-spl.bin.normal.out) from the
+partition with type GUID 2E54B353-1271-4842-806F-E436D6AF6985. You are free
+to choose any partition number.
+
+With the default configuration U-Boot SPL loads the U-Boot FIT image
+(u-boot.itb) from partition 2 (CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION=0x2).
+When formatting it is recommended to use GUID
+BC13C2FF-59E6-4262-A352-B275FD6F7172 for this partition.
+
+The FIT image (u-boot.itb) is a combination of OpenSBI's fw_dynamic.bin,
+u-boot-nodtb.bin and the device tree blob.
+
+Format the SD card (make sure the disk has GPT, otherwise use gdisk to switch)
+
+.. code-block:: bash
+
+ sudo sgdisk --clear \
+ --set-alignment=2 \
+ --new=1:4096:8191 --change-name=1:spl --typecode=1:2E54B353-1271-4842-806F-E436D6AF6985\
+ --new=2:8192:16383 --change-name=2:uboot --typecode=2:BC13C2FF-59E6-4262-A352-B275FD6F7172 \
+ --new=3:16384:1654784 --change-name=3:system --typecode=3:EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 \
+ /dev/sdb
+
+Copy U-Boot to the SD card
+
+.. code-block:: bash
+
+ sudo dd if=u-boot-spl.bin.normal.out of=/dev/sdb1
+ sudo dd if=u-boot.itb of=/dev/sdb2
+
+ sudo mount /dev/sdb3 /mnt/
+ sudo cp u-boot-spl.bin.normal.out /mnt/
+ sudo cp u-boot.itb /mnt/
+ sudo cp Image.gz /mnt/
+ sudo cp initramfs.cpio.gz /mnt/
+ sudo cp jh7110-starfive-visionfive-2.dtb /mnt/
+ sudo umount /mnt
+
+Booting
+~~~~~~~
+
+Once you plugin the sdcard and power up, you should see the U-Boot prompt.
+
+Serial Number and MAC address issues
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+U-Boot requires valid EEPROM data to determine which board-specific fix-up to
+apply at runtime. This affects the size of memory initialized, network mac
+address numbering, and tuning of the network PHYs.
+
+The Star64 does not currently ship with unique serial numbers per-device.
+Devices follow a pattern where the last mac address bytes are a sum of 0x7558
+and the serial number (lower port mac0), or a sum of 0x7559 and the serial
+number (upper port mac1).
+
+As tested there are several 4gb model units where the serial number and network
+mac addresses collide with other devices (serial
+``STAR64V1-2310-D004E000-00000005``, MACs ``6c:cf:39:00:75:61``,
+``6c:cf:39:00:75:62``)
+
+Some early Star64 boards shipped with an uninitialized EEPROM and no write
+protect pull-up resistor in place. Later units of all 4gb and 8gb models
+sharing the same serial number in EEPROM data will have this problem that the
+network mac addresses are alike between different models and this may be
+corrected by defeating the write protect resistor to write new values. As an
+alternative to this, it may be worked around by overriding the mac addresses
+via U-Boot environment variables.
+
+It is required for any unit having uninitialized EEPROM and recommended for
+all later Star64 4gb model units (not properly serialized) to have decided on a
+new 6-byte serial number. This serial number should be high enough to
+avoid collision with other JH7110 boards and low enough not to overflow i.e.
+between ``cafe00`` and ``f00d00``.
+
+Update EEPROM values
+^^^^^^^^^^^^^^^^^^^^
+
+1. Prepare EEPROM data in memory
+
+::
+
+ ## When there is no error to load existing data:
+ mac read_eeprom
+
+ ## When there is an error to load non-existing data:
+ # "DRAM: Not a StarFive EEPROM data format - magic error"
+ mac initialize
+
+2. Set Star64 values
+
+::
+
+ ## Common values
+ mac vendor PINE64
+ mac pcb_revision c1
+ mac bom_revision A
+
+ ## Device-specific values
+ # Year 2023 week 10 production date, 8GB DRAM, optional eMMC, serial cdef01
+ mac product_id STAR64V1-2310-D008E000-00cdef01
+
+ # Last three bytes mac0: 0x7558 + serial number 0xcdef01
+ mac mac0_address 6c:cf:39:ce:64:59
+
+ # Last three bytes mac1: 0x7559 + serial number 0xcdef01
+ mac mac1_address 6c:cf:39:ce:64:5a
+
+3. Defeat write-protect pull-up resistor (if installed) and write to EEPROM
+
+::
+
+ mac write_eeprom
+
+Set Variables in U-Boot
+^^^^^^^^^^^^^^^^^^^^^^^
+
+.. note:: Changing just the serial number will not alter your MAC address
+
+The MAC addresses may be "set" as follows by writing as a custom config to SPI
+(Change the last 3 bytes of MAC addreses as appropriate):
+
+::
+
+ env set serial# STAR64V1-2310-D008E000-00cdef01
+ env set ethaddr 6c:cf:39:ce:64:59
+ env set eth1addr 6c:cf:39:ce:64:5a
+ env save
+ reset
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