Using Orange Pi One as an SPI programmer with flashrom

That's quite simple. I was using Armbian Buster with 4.19.62-sunxi kernel.

You need to enable the spi-spidev overlay, which you can do by using armbian-config utility (go to System -> Hardware and enable spi-spidev), or by adding overlays=spi-spidev line to /boot/armbianEnv.txt.

You also need to add param_spidev_spi_bus=0 to /boot/armbianEnv.txt.

Then reboot, make sure that spidev module is loaded and that you have /dev/spidev0.0 device.

Then you're ready to use flashrom:

# flashrom -p linux_spi:dev=/dev/spidev0.0

P.S. Here is the pinout for SPI:

+--------------------------------------------------------------+
|                                                              |
|                                                              |
|                                                              |
|                                                              |
|                                                              |
|               Orange Pi       #                              |
|                             #   #                            |
|                           #       #                          |
|                         #    H 3    #                        |
|                           #       #                          |
|                             #   #                            |
|                               #                              |
|                            GND    CS                         |
|                             |     |                          |
|  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  |
|  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  |
+--------------------------------------------------------------+
                           |  |  |  | 
                        3.3V  |  |  CLK
                              |  |
                           MOSI  MISO