This is the Wiki for the U-Boot on Renesas R-Car Gen3 SoCs and boards . Refer to the R-Car page for information about Renesas' R-Car SoC family.
As of U-Boot 2018.01-rc1, the following boards are supported:
|Board||U-Boot defconfig||Update procedure|
|R8A7795 H3 ULCB||r8a7795_ulcb_defconfig||Flashing firmware|
|R8A7796 M3 ULCB||r8a7796_ulcb_defconfig||Flashing firmware|
|R8A7795 H3 Salvator-X ES2.0+||r8a7795_salvator-x_defconfig||N/A|
|R8A7796 M3 Salvator-X||r8a7796_salvator-x_defconfig||N/A|
- RCar R8A7795 H3 ES1.x is NOT supported!
- Running mainline U-Boot is only supported with IPL/ATF/BL revision 2.23 and newer.
- ARM cross-compiler is mandatory to build U-Boot (OpenEmbedded generates this for you).
If you intend to build both IPL/ATF/BL and U-Boot using OpenEmbedded with meta-renesas layer, you can skip this step.
Debian and Ubuntu includes an ARM cross-compiler in its standard package feed. You can install it as follows:
apt-get install gcc-aarch64-linux-gnu
Other distributions likely also provide ARM cross-compilers. Consult distro-specific documentation for details.
Obtain U-Boot sources
The preferred method of obtaining U-Boot sources is through git VCS, using git protocol:
git clone git://git.denx.de/u-boot.git
or via HTTP:
git clone http://git.denx.de/u-boot.git
Finally, check out the version of U-Boot that will be used for the build:
cd u-boot git checkout -b my_working_branch v2018.01-rc1
U-Boot | git hosting also provides snapshots.
Prepare build environment
Before building U-Boot for RCar Gen3 system, the following environment variables need to be configured:
export ARCH=arm64 export CROSS_COMPILE=aarch64-linux-gnu-
The later variable must match the prefix of the Aarch64 cross-toolchain installed on your system, the example above is valid for Debian and Ubuntu,
To produce u-boot-elf.srec file during U-Boot build, a patch  must first be applied:
git am 0001-Makefile-add-u-boot-elf.srec-if-CONFIG_REMAKE_ELF-is.patch
or in case U-Boot snapshot was used:
patch -Np1 -i 0001-Makefile-add-u-boot-elf.srec-if-CONFIG_REMAKE_ELF-is.patch
Then the U-Boot sources must be configured for a particular supported platform. List of platforms and matching defconfigs is available at supported boards.