Renesas RZ/N1


This document describes how to build and flash U-Boot for the RZ/N1.


Clone the U-Boot repository and build it as follows:

git clone --depth 1
cd u-boot
make rzn1_snarc_defconfig
make CROSS_COMPILE=arm-linux-gnu-

This produces u-boot which is an ELF executable, suitable for use with gdb and JTAG debugging tools.

It also produceds u-boot.bin which is a raw binary.


The BootROM in the RZ/N1 SoC expects to find the boot image in SPKG format. This format is documented in Chapter 7.4 of the RZ/N1 User Manual.

The binman tool may be used to generate the SPKG format for booting. See tools/binman/binman.rst for details on this tool and its pre-requisites.

binman -d arch/arm/dts/r9a06g032-rzn1-snarc.dtb -o <OUT>

This will produce u-boot.bin.spkg in the specified <OUT> directory. It can then be flashed into QSPI, NAND, or loaded via USB-DFU mode.

SPKG image

Alternatively, the same SPKG image can be built by calling mkimage as follows:

tools/mkimage -n board/schneider/rzn1-snarc/spkgimage.cfg \
        -T spkgimage -a 0x20040000 -e 0x20040000 \
        -d u-boot.bin u-boot.bin.spkg

This produces u-boot.bin.spkg which can be flashed into QSPI, NAND, or loaded via USB-DFU mode.

Take note of the load and execution address, which are encoded into the SPKG headers. For development convenience, mkimage computes the execution offset (part of the SPKG header) by subtracting the supplied load address from the supplied execution address.

Also note there are other parameters, notably ECC configuration in the case of boot from NAND, specified in the spkgimage.cfg configuration file.


The RZ/N1 is able to boot from QSPI, NAND, or via USB (DFU). In all cases the on-board BootROM expects for the binary to be wrapped with a “SPKG” header.

It is possible to recover a bricked unit by using the USB (DFU) boot mode. This allows uploading U-Boot into the internal RAM. Thereafter U-Boot can be used to program the QSPI and/or NAND, making use of U-Boot dfu mode.

Otherwise the only other option for recovery is via JTAG.