Installation
------------------
Unpack the IMAGE file and copy the image an SD card: (assuming SD card at /dev/mmcblk0):

  # zstd -d irradium-*-core-*-build-*.img.zst
  # dd if=irradium-*-core-*-build-*.img of=/dev/mmcblk0 bs=1M

or unpack directly to the card

  # zstdcat irradium-*-core-*-build-*.img.zst > /dev/mmcblk0


Instalation eMMC/NAND/USB-HDD
------------------
to transfer a system with the SD to eMMC, you need to boot from the start and run the script:
  # transfer-to-disk


Default Login
------------------
login: root


Debug
-------------------
    Pin 6   is GRD
    Pin 8   is RTX (GPIO14/UART_TX)
    Pin 10  is TXD (GPIO13/UART_RX)

example: sudo screen /dev/ttyUSB0 115200,cs8


Flash SPI
-------------------
    https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/spl_new.html

    cat /proc/mtd
    flashcp -v u-boot-spl.bin.normal.out /dev/mtd0
    flashcp -v visionfive2_fw_payload.img  /dev/mtd2
    irradium: u-boot-spl.bin.normal.out -> u-boot.bin and visionfive2_fw_payload.img -> u-boot.itb


Recovery
-------------------
    https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/recovering_bootloader%20-%20vf2.html


Boot Mode Settings
-------------------
    https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/boot_mode_settings.html
    QSPI Nor Flash    0    0
    SDIO3.0           0    1
    eMMC              1    0
    UART              1    1