Flashing

After you have either built your own Buildroot images or downloaded the prebuilt binaries, the next step is flashing them to the board.

Before starting, make sure you have:

• Downloaded the preferred image for your SoC and extracted it, or built it yourself.
• Downloaded DevCube from http://dev.bouffalolab.com/download.
• Connected the BL808 board to your PC over the serial port.
• Put the BL808 board into programming mode: Press the BOOT button while resetting or applying power, then release BOOT.

Flashing does not work with DevCube v1.8.4, so use v1.8.3 or another known-good version. See openbouffalo/buildroot_bouffalo#60.

• Run DevCube, select BL808, then switch to the MCU page.
• Select the UART port and set the baud rate to 2000000.

UART mapping for the MCU page:

• TX: physical pin 1, GPIO 14
• RX: physical pin 2, GPIO 15

On the MCU page:

• Under M0 Group[Group0], set the image address to 0x58000000 and select m0_lowload_bl808_m0.bin.
• Under D0 Group[Group0], set the image address to 0x58100000 and select d0_lowload_bl808_d0.bin.
• Click Create & Download and wait for completion.

• Switch to the IOT page in DevCube.
• Enable Single Download.
• Set the address to 0x800000.
• Select the bl808-firmware.bin file.
• Click Create & Download again and wait for completion.

Flash either sdcard-pine64-*.img.xz or sdcard-pine64-*.img to the SD card using dd after decompression, or use balenaEtcher.

To access the SoC console:

• TX: physical pin 32, GPIO 16
• RX: physical pin 31, GPIO 17
• Baud rate: 2000000

Double-check the image addresses and file paths before flashing.