Flashing RZ/G2L Boards

Initial Bootloader Flashing


Due to serial transfer, this process takes some time. Usually you have a working bootloader on your board, so you can skip this section.

Yocto generated images and our precompiled images contain the install-bootloader.sh script.

Make sure to put the board into Download Mode - See: Enabling USB-Bootmode

For running the script, pass the serial port device, and let it work for you. The serial port normally is something like /dev/ttyS0 or /dev/ttyUSB0:

cd <image-directory>
./install-bootloader.sh /dev/ttyS0

The output will look as follows:

Started bootloader flash process on /dev/ttyS0

Put your board into SCIF Download mode
When done press any key to continue...

Sending FlashWriter:
269312 bytes (269 kB, 263 KiB) copied, 23 s, 11,6 kB/s
269+1 records in
269+1 records out
275980 bytes (276 kB, 270 KiB) copied, 23,458 s, 11,8 kB/s

BL2 transfer:
107520 bytes (108 kB, 105 KiB) copied, 9 s, 11,6 kB/s
115+1 records in
115+1 records out
118724 bytes (119 kB, 116 KiB) copied, 9,91065 s, 12,0 kB/s

FIP transfer:
2274304 bytes (2,3 MB, 2,2 MiB) copied, 196 s, 11,6 kB/s
2223+1 records in
2223+1 records out
2276684 bytes (2,3 MB, 2,2 MiB) copied, 196,241 s, 11,6 kB/s

Writing eMMC partconf

Done. Put the board into normal bootmode and reset it.

You can also notice output in serial terminal while flashing.


After flashing put the board back to normal bootmode and reset it.

Flashing via Fastboot

Flashing to eMMC is done via Fastboot protocol using UUU.

If you are not familiar with UUU follow UUU - Universal Update Utility.


For flashing RZ/G2L boards with UUU it’s not necessary to put the board into Serial Download Bootmode. You have to start fastboot from U-Boot manually.

Yocto generated images and our precompiled images contain the uuu.auto script.

When UUU is installed on your host and ready to use, simply run:

cd <build-directory>/tmp/deploy/images/$MACHINE/<image-directory>
uuu -v

Now enter the U-Boot prompt on your target via serial terminal and type:

fastboot usb 0

Now UUU partitions your board and flashes the filesystem.


After flashing with UUU has finished, the desired Linux image will boot.