Orange pi

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Orange pi 5 plus

Booting from eMMC

  • Enable to boot from eMMC is more convenient since it asks to clear SPIflash. Therefore, we can easily to switch to boot from eMMC or SD card.
    • By default SD card has a higher priority to boot than eMMC.
    • I can use eMMC as the main OS storage and use SD card to play with different OSs.
    • Even I follow the instruction to use RKDevTool to put a Linux image onto eMMC, I still cannot boot from eMMC until I clear SPIflash.
    • eMMC is /dev/mmcblk1, speed is 271 MB/s (sudo hdparm -t --direct /dev/mmcblk1p2 )
    • SD is /dev/mmcblk0, speed is 62 MB/s (sudo hdparm -t --direct /dev/mmcblk0p2 )
  • From Linux
$ ls -l /dev/mtdblock0
brw-rw---- 1 root disk 31, 0 Dec 10 06:00 /dev/mtdblock0
  • If you want to boot from eMMC on the Orange Pi 5 Plus, you would need to clear the /dev/mtdblock0 partition. This is because the /dev/mtdblock0 partition typically contains the bootloader, and clearing it allows you to install a new bootloader that can boot from the eMMC.
    • Here is a general guide on how you can do this: Boot Armbian from an SD card.
    • Clear the SPI flash memory by running the following command in the terminal: sudo dd if=/dev/zero of=/dev/mtdblock0 bs=1M count=1

Booting from NVME

SPI flash, non-volatile memory

  • SPI Flash in a Single Board Computer (SBC) refers to a type of flash memory that uses the Serial Peripheral Interface (SPI) for communication. This is a common type of non-volatile memory used in SBCs and other embedded systems.
  • Many embedded systems, including SBCs, use non-volatile memory to store boot code, configuration parameters, and other data that persist when the system is powered down. Common Flash technologies include Parallel or SPI NOR flash, SLC NAND, and eMMC devices.
  • In the context of system booting, the processor starts executing at the reset vector and attempts to execute the first code. Some processors have a small internal boot ROM that can be programmed at manufacturing time. The boot ROM can also detect where the bootloader was stored; for example, in an external NOR or NAND flash device.
  • If a NOR Flash device is used to store the bootloader, the processor can directly run off the Flash device. This method is commonly called eXecute In Place (XIP). If a NAND or eMMC device is used, boot code first needs to be copied to the system’s RAM. Then the processor can jump to the RAM space and execute. This method is called shadowing or Store-and-Download (SnD).
  • For example, the ROCKPro64 SBC has a 128Mbit SPI Flash, and the Odroid N2+ SBC features an 8MB SPI flash with a boot select switch and Petitboot app.

Android OS

  • For enhanced security, it is recommended to install the SDDiskTool on a virtual machine or a non-critical Windows system. This precautionary measure can help mitigate potential security risks. I experienced a blue screen error during my initial use of the software, which underscores the importance of this safety advice..
  • The instructions provided for installing onto an SD card work. However, to successfully boot from the SD card, it is necessary to remove the eMMC first.

Tips