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Flashing images

Build QDL tool

QDL tool communicates with USB devices of VID:PID 05c6:9008 and uploads a flash loader, which is then used for flashing images. Download and build QDL by following the upstream build instructions: Build QDL.

As QDL tool requires raw USB access, to be able to run it as a non-root user create an appropriate udev rule by following steps described in Update udev rules

Prepare the Board

RB3 Gen 2

Location of all DIP switches, USB debug port and buttons (F_DL for instance) can be found on RB3 Gen 2 Quick Start Guide.

  1. Set up DIP_SW_0 positions 1 and 2 to ON. This enables serial output to the debug port.
  2. To put the device into EDL mode press and hold the F_DL button before connecting the power cable.

Flash images

Make sure that ModemManager is not running, disable it if necessary.

  1. Connect the micro USB debug cable to the host. Baud rate should be 115200. Check in dmesg how UART shows up (e.g. /dev/ttyUSB0):

    $ sudo dmesg | grep tty
[217664.921039] usb 3-1.1.4: FTDI Serial Device converter attached to ttyUSB0

  2. Use your favorite serial communication program to access the console, such as minicom, picocom, putty etc. Baud rate should be 115200:

    picocom -b 115200 /dev/ttyUSB0

  3. Plug in the USB-C cable from the host.

  4. Use the QDL tool (built in the previous section) to flash the images:

    cd build/tmp/deploy/images/rb3gen2-core-kit/core-image-base-rb3gen2-core-kit.rootfs.qcomflash
qdl --debug prog_firehose_ddr.elf rawprogram*.xml patch*.xml

    If you have multiple boards connected the host, provide the serial number of the board to flash through --serial param:

    qdl --serial=0AA94EFD --debug prog_firehose_ddr.elf rawprogram*.xml patch*.xml

    Serial can be obtained using lsusb -v -d 05c6:9008 command.

  5. Ensure that the device is booted in Emergency Download (EDL) mode (please refer to Quick Start Guide for your board). The process of flashing should start automatically:

    USB: using out-chunk-size of 1048576
HELLO version: 0x2 compatible: 0x1 max_len: 1024 mode: 0
READ64 image: 13 offset: 0x0 length: 0x40